Malicious PDF — malware analysis report

Static analysis result for SHA-256 2948643606d5978c…

MALICIOUS

PDF

80.6 KB Created: 2021-08-28 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 928e5578944e1474850a49387ebf0354 SHA-1: eff3df22f12e4d2a382e90ed7c08161b956472a8 SHA-256: 2948643606d5978cf660cd8feca444cafc56ccaca5b5e51c78314597f9252352
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URI heuristics and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://synerhu.ru/uplcv?utm_term=how+to+unlock+a+phone+if+pattern+is+forgotten PDF link annotation
    • http://stressmanagement-karriere.de/userfiles/file/70588936066.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/47f874e83b9c9d7473a1599690470ac9/roniwemixaxumiboz.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/razarirubizozolun.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/finafakepipumop.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/jasisujufogajokag.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/vekejawimero.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/703cba0f010d45a3ac9d0d6537fd9e58/3948911738.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc30cde44---wafijudutaweraresifojeto.pdfIn PDF document text
    • https://network-italia.it/file/74190227454.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/34678361251.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/viwamevokilodegiwoxuxemu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d65c1caa---kamefagezikimi.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/24770398520.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/16cd687c27efa16596d9f8f098819999/87460524470.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/fimurixovepatar.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61a4076f1---jimun.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a2554109---vazigixinevetedadapaxuwax.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/16614671421.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/78396080785.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/23128431640.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe7f33d3a---10534258839.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/xazuverofubaxolobowebi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/dubuzifutozawa.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 17088 bytes
SHA-256: 2debb523c5e5680a48a5117ae06120ae0af1d7bcebd0cfce897345c3a8cbd614
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 11028 bytes
SHA-256: 21e2b6839a7a26b13acaa16f867d4cfd63b1ebdb43b051b6863d92458a35fb87

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