Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c191bbecc83870…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 00:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61fca8d4c12bc2dc85abf7962006452f SHA-1: 45c09ff2d6097515c158e31fe83cd855a2b698dd SHA-256: d4c191bbecc83870dac57b9fc6372f56c870432bbb6dfbf222339db3354e6838
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple URLs, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://master-br.ru/img/file/14578157218.pdf In PDF document text
    • http://malovanesklomh.cz/images/file/kujebiba.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/haq31md9qbdjgra8t4ovhor2eb/56614211683.pdfIn PDF document text
    • http://sakra.sk/storage/file/3401991002.pdfIn PDF document text
    • http://zeci.nl/im/image/zakobusufe.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/17184688187.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141117534663---59698070402.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/laguwidud.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/gewipiropivemitetalapun.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q893ko23mdvrk0o4m5jric11h7/13463881793.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/9716824147.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jagegikoliw.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vezipamalobozo.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/rafezilaviwipiwesul.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021202522147.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/68661766082.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/zuvonaremebitesiwix.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/wajorikajapubel.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6f0bf29938a98eeb86b5fd876738c22a/dakuwofuredarupisonawu.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xifuxem.pdfIn PDF document text
    • http://lovesenergy.com/file/67218888279.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/badulenalu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/birobebomikoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=mighty+morphin+power+rangers+apkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/79553669949.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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 10940 bytes
SHA-256: 99cf7ea45ca1f3b24705169098b21abb06253cb737b566ec32a2c6c69e050575
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 17976 bytes
SHA-256: 44209b0d05ea4045414641304738bffdc2ee425bf721e21d50d3335bdd5784a9

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