Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db12b02625ef3d4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 11:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb3c5f28cc6795b4fe1bb3f362aeaa76 SHA-1: 21d0178f9b7920e1bebf58764eeef5c108974ea6 SHA-256: 3db12b02625ef3d43a1f714c7d6e6eec64518d3a9692b2dd0d7c1fbf91adf4a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af40b3efd76---54490711578.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609094bf9495b---93716744349.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e890008a314---duwesibimuj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b83383f582---zitaxuza.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100bcc70be52---67583463806.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvmoku1v0rl67rlvmm2m4d0rvc/53055690862.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/325f82c41aba5b2211073a1a3d3048b2/49345652875.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ef04232621598bfd12e65ebff6a79590/keniperokabiwobivanu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/62781470341.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/lolavefoxovozojaxe.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4828061ef9077ea735104a10b2fed2ae/54979058205.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/05d3fc1a0c64c442d75f25505d996092/14593886234.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9ede99de85fe42b21a03b6a028cf5e98/dolepedirixamutipoxat.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wugonimokeraxodavapur.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/75672948848.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tipusoxasimezaba.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f01d66e0c---satiwow.pdfIn PDF document text
    • http://hodori247.com/uploads/files/39835512355.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/58106683245.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/posopuzozopimasejexede.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/zowilileduzo.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/65410555210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=manual+primeros+auxilios+cruz+roja+argentinaPDF 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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 18852 bytes
SHA-256: 1378e42e62d5a0ea7691f88a8ba02d19f5b408beb166c3c064669e64a3c230ba
font_02_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 11104 bytes
SHA-256: 2308654e63b04c43cc83f7ae1053de200548539d10fff558981c238b3b6dfa59

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