Malicious PDF — malware analysis report

Static analysis result for SHA-256 685e5c98e4923aba…

MALICIOUS

PDF

87.7 KB Created: 2021-07-20 23:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 84dcabf9bdcb95708a95353063c89ea4 SHA-1: 54c98b562b00c3bdf2634788bd5a37cfa65d3bdd SHA-256: 685e5c98e4923aba286c3ff52add2e3f02f85b1dc22cc56ac23c6ad3cc0da4cc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The document body was unreadable, but the heuristic firings strongly indicate a lure to external, potentially compromised, web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/580be6f1151c908985da2319c4dbe037/58608089886.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbffcaab2---45034951230.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tixiwosikonelisat.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/92288211144.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16248412836117.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/69449290578.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b3669d57---66348384254.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c94f67890e7a3aff18e4db29fa76b1f7/widipetomogeju.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2690302a---bebijegubofudizu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c070e200bd---94217129832.pdfIn PDF document text
    • https://avenue102.com/uploads/file/91915729706.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/fezoxug.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/522134f323e46b178571622c1cee4761/nukederixu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2fcad1515---48053002915.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/54638737649.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abe56821c---lipaparafixuz.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/27655129112.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vixogamiteb.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fa5b4c735---worizekarekan.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/basusejirifake.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/figudupeku.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de4ae9111---65441754504.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac0bf6553d---zejodiwaxujedifemuketoj.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/8358779310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=afk+arena+factions+guidePDF 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_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 17180 bytes
SHA-256: f095f0f3033f0e875b666211b7c873ddf3c120d0fda631b520270c9836e281d1
font_02_sfnt_off000138ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EF 10776 bytes
SHA-256: 66f45f37a795e696bf887d420ae901188b21cd330ddf708f5d45152391b75399

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