Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e6fd17dc9bd28…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 19:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c7e6a05a0f6075565220c252210f2e70 SHA-1: 1c0fd2b7c8b226844941534d4b2d580baabdbe51 SHA-256: 6d8e6fd17dc9bd284dcefc45c04af6bb9b2943718a635ded41edc90446854532
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains multiple links pointing to compromised WordPress sites, which are likely used to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The presence of a link farm on disposable or compromised hosting is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161377963e2c13---sofajobix.pdf In PDF document text
    • http://mikllc.mn/uploads/files/rudipepivosigulegino.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/36233895740.pdfIn PDF document text
    • http://skupka23.ru/upload/m/59330587432.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zetaw.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/mitadewo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142531494f45---sisuzoz.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/31462181566.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/54395927128.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/543765013.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091603232676.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/fuvaxuvawodewaf.pdfIn PDF document text
    • http://apicn.net/upload/files/muwutewuv.pdfIn PDF document text
    • http://aprt1day.ru/file/tifob.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/71422527383.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/54246140464.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631441666.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/tositepigosijupimamosoj.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/23996239706.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8fb9975b---35250093203.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/fagudikimupojiz.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/86883512685.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/8347259417.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/73231050499.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/64068544780.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/24124625504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=airplay+android+apkPDF 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_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 21008 bytes
SHA-256: 34f692023959733592dde1573f9612a966a1ebc1a242eadc97b1f39159f9cd6d
font_01_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 10172 bytes
SHA-256: 557945e6f74c977adf88d0e48907dfd4e814eb7e7061128a9af3372f596b4426