Malicious PDF — malware analysis report

Static analysis result for SHA-256 c973112a4750d5d1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 12:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e1ab0ec69fa0e25a72bce0c954c328 SHA-1: 06d40afa4b729e50e2523ba4dc5f3f16b639bef2 SHA-256: c973112a4750d5d19ee5ee5c69b0398db0f44156281423b3221c607f520918f5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. Several heuristics point to the PDF being part of a link farm hosted on compromised CMS platforms, with one URL directly pointing to an IP address. The document likely serves as a lure to download further malicious content, as suggested by the phishing and Trojan detection.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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 http://transsnabstroy.com/userfiles/file/xogamur.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ee974527304d68d991e99b4254766dab/gexipudagam.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c6f20abbf2c400c1714e7a9cd3d50b5b/zejedinoligirotasas.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cg9obua2o3h59lk49oj0i7kig5/faroxulotavezelabufana.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/73031076215.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/82247757935.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4016c3e66---gabirepoxuxabudibu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c8d1e861e---xexigedodefizafosaz.pdfPDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0290682fbb---12842968035.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/6639950038.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/raxebiwolasulezavedego.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b498076ddd0---91556369273.pdfIn PDF document text
    • http://jucal.es/images/file/pefakuvexelovige.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tininokawumif.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/80bmm443bujl9fs1p2ngsa0hb6/nifexasutaxeleg.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d28380e89c3---78225797285.pdfIn PDF document text
    • http://laduses.nl/image/file/jedugufobaw.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e87185d3b37---kagazovexekosofoked.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/wozanemetukoxavosewu.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/79983755160.pdfIn PDF document text
    • http://ihdbd.org/upload/files/dolebenefeguvezugaxom.pdfIn PDF document text
    • http://badgerhillfarm.uk/moxupenilutapemaputado.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e71b00c14---24303318992.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/fidisosuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=critical+path+method+example+questions+and+answers+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 17444 bytes
SHA-256: 43fac3a6ee6e2ade6cbfcb8984608adc7023cb1aeaa33758828a1e3189cd7d2a
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 11352 bytes
SHA-256: 510f095cee629978d80806dca216810c786e2d3100e8652857d6b6033594645f
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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