Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6765078dda8be37…

MALICIOUS

PDF

121.3 KB Created: 2021-08-12 18:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 18e7966d3bdbbadfa092d54ea7e24bb4 SHA-1: 89ca19dc3fe847165083ffd833bd4944940e86ac SHA-256: d6765078dda8be37cf1f2946ea53a27091dbebcd41801781d4aa22662a4dd9c5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://gwhs79.com/clients/867100/File/filaranadozowuvo.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f31679385---70632186533.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/18046743215.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6667bc9ffb---73486189018.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/xemekujipowuniwofemup.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/32847874965.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3535d2a1---88768260938.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/dufufogemipemonikov.pdfIn PDF document text
    • http://topstec.com/d/files/37444386015.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8980a2f7---76601822604.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/letipebekuwerobumima.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vezudezazulanudugobulaga.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8d1c0db1c735719aa8362bc24c45f06b/juliwasevitesor.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/4203492336.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/id2maus8c11gssmetfgdb42mda/gopefapamu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/sazovomo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53b3dd34e---rutubodurupave.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/wirakabojarenolisi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60719913863.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xotupofujidu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6d8beae99f71c06210c4860bc91bc101/jojevase.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/nofinotokisutibotonegodu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16114440d9a8e7---vogomelejuxuwusex.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73dc68605---fabadilitosize.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611336108bec5---49052181136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=government+accounting+millan+solution+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001659a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB1 11168 bytes
SHA-256: 4a215cfd84468c677157d6b3a2a89fe5dcb02cd17c9eed3b33fe41b2c19d2f47
font_02_sfnt_off0001979d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1979D 1900 bytes
SHA-256: cde5e0a79f29f2dfbb6749d33405e6078146f1f3fbafb7052325e3acd8b01878
font_03_sfnt_off0001a05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05D 20640 bytes
SHA-256: b861843a3bd18d03338767f8fcbc41366f151277f7088d02388959aa3e7928c3

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