Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c64f59999c5aac2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 18:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d0b35a47fd33d58c2efba170556ef809 SHA-1: 5f94e38a17cdc26ff3918b68d6b806dfee39adaf SHA-256: 0c64f59999c5aac2fba76671e446f48538858c2bbfd3b71dc09d9531d70f3949
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=drager+alcotest+6810+service+manual PDF link annotation
    • http://getampedmag.com/ckfinder/userfiles/files/50914902966.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136b904d39dd---rogovirevevawupono.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021921322184603.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lefedomelajuxelumex.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137771f0f53a---kovifolebomeloperuna.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/tefegexesivemeduvogo.pdfIn PDF document text
    • http://kasand.com/userfiles/mulovumurojejarabo.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/24185743146.pdfIn PDF document text
    • http://dges.in/userfiles/file/subojufuvo.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/fexofotowulidaweratag.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/32116991805.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/lateronozaginavelinuj.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e8634f4c---sofeferuronuvedi.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/juxonefesi.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/34670034730.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/wivefufexitez.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/60964256443.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/35567083937.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/barirumajirami.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37641692426.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/20637537731.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/famir.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/53158822114.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/50030613515.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 11288 bytes
SHA-256: 0bd299688b27e7f7f530d057133e8a4b2d8490c8271f873d2af45e2d2096a8ff
font_01_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 18404 bytes
SHA-256: fc8a60117d163da237db6f97c01b648af26f81d3f14f877098ce4f397ee37477
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1