Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f10bd4451d9b1a0…

MALICIOUS

PDF

79.0 KB Created: 2021-06-26 14:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f1f378155fb7a8772f7bc84d119f0c0 SHA-1: c8979a968c4a23e73d10647f2a03ff928d529854 SHA-256: 0f10bd4451d9b1a07195a8cb9a6810c0da605e9e5637e28605ac3c7175b6d7d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions and a password to decrypt a malicious archive, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=nct+127+chain+mp3+download PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d65c2ee7ac5---simobulajeporogulawu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3226142032---jidefegujufiduf.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/210516182253115838rnnaj9a07gjw.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160782ec64a54a---63235277075.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/19379035562.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/48fd735e6d1d2d26500ba60824ba98f3/vagebapuxuludenawune.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb7ebe8e---53588498858.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/hbs7i5ttsa39te6uf61mltq6n0/75826318734.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7731d078716ff29e6d95603f3b6a2b51/subuvuniwoj.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/82a21919153d9d5ad8bcddd2b9bb6931/79411687367.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b32058ec18a4a50752d57e009286f18c/terenemofasififubo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/dirowukona.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f8b797c28f8e8ca9383466533c8c32b6/bekewod.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d0db837a---89981507753.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ded9b6afbcc123c33232436ad1f2aff5/68186924225.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5276997413f4572eee5e82c3c00db7b5/46234812699.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae657b0b74d---81895192911.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33b8b23ed---masivesotezemesujox.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78056150a0---gevewomikikapaf.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/fefajux.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kaligoluwelajewob.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae5b569093---51166300016.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f5aed86b---mufafedavesetipujik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10836 bytes
SHA-256: bd0fe43b7536a3b763c60eb0a0ea05686148bd1e213c1a46c202cb7fed8a23c7
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 2572 bytes
SHA-256: dbd0f199df7fb494cac436db0cc82a6163a31a095be68b0a990836b5667da31f
font_03_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 17292 bytes
SHA-256: ea9f844711e822c33125dd3eecea4acd7957fb6122b10ab7fa90936e1c3f8de7

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