Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b395ad6170b6d1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 22:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aaceb3432f8540ddc25fe19a1272ce7a SHA-1: 217a50a4545176f8edb0f8810a2b41b763ce4a3b SHA-256: 95b395ad6170b6d1e8e8102db0f56bd87be14dc9c104aff62bbcad6b364db4c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Numerous heuristics point to the file being a link farm, with many URLs hosted on compromised CMS uploads or disposable domains, suggesting it's used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kalitelivideoizle.com/resimler/files/wiwad.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/4ee687d324629b375a32c75f8b67c71e/73841873613.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/145a4c795785e3f00d0bd3faa7c863ab/kuzozakovapuponajapi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rh626at6d1l8f56an7o7fg9haa/70624224413.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/juvajujuzikajimopajuraj.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uk7qfpp6tts8q5tk9vcmg0g773/51818660706.pdfIn PDF document text
    • http://hnspkjx.com/d/files/dekepajukalururoxiz.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741292c5e2f---gerobosexalanoselomugivu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b82441d32ec---31185182190.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160864a291e10a---36423773512.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/lubewi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zibuwoxoxegi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e21d61f---78235251652.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/wamegesexo.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/pokafolukiwok.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/71829068917.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/34206297341.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/6f381d5e3bb1c203d8ad52a1e3240175/sufenajitugevafo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/54e7110221adb6bd5f37b6fb329b8555/26540685977.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/kalotikopulegumorebed.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/kuvaxogofob.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/60407875220.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/31698677629.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/94087953331.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d625fdc9e375e91a87d33894da799945/beriradumorozofefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=certificate+of+appreciation+for+resource+personPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10556 bytes
SHA-256: ea020b58e56d195052fd638dfff26463e972a21983a0a5ff1efc65d6d917b9a5
font_01_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 18408 bytes
SHA-256: 19be2363df72171e1a55134e213129a57c5e222037674a89c93f082e95a639e2