Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2d642c23ec670e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 15:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cb20347e0f61cade3b744286148b64d SHA-1: 597180f000340e6462e308eb1df0612b6df3efc4 SHA-256: fb2d642c23ec670e4903690c347d7d6bac26a4c64f1d4016cec404b4b9693943
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=how+to+change+4g+band+in+android PDF link annotation
    • http://trieuduong.com/images/Download/wegavekakiwa.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449b3cbdc29---88619311750.pdfIn PDF document text
    • https://10fci.net/userfiles/file/pepolopafuxaxasuwigo.pdfIn PDF document text
    • https://rotitelor.com/contents/files/pebusemovena.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-1/20210901060430213308.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/48238620525.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5273bc6ea47b47a44541806a745aa377/golavofi.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/dosikimujejonipedebosa.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/zupiz.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/tavajinowileliripeditoz.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/tegezufedisusobifaladenas.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/bopibirulozutimiz.pdfIn PDF document text
    • http://linker-apps.com/files/wapuwunilumenodow.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/piradoboruset.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3eccb903b541ae0dada26392dfb3de82/61354717829.pdfIn PDF document text
    • http://4yoga.by/pics/files/gosulakawopajuxuguwilom.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161336fb4468c2---pivesogarow.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/rezolonuzikig.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/wupefarisibe.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dunegozoke.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zifonuzukutolezurewad.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 10728 bytes
SHA-256: a32e1a07c8680b0db4445f3467ae24cce2725e8b1087405c3100adfea13eb76e
font_02_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 17684 bytes
SHA-256: e262debec8b3f791ae391a6f5428198e697c3d45adb83d30fba2d6931da03510