Malicious PDF — malware analysis report

Static analysis result for SHA-256 caad02747f636eb5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 04:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60f4b724b945a334d8d161c27b941fe2 SHA-1: a26ffdc75607c427eafe9621bf96f1a930b345fb SHA-256: caad02747f636eb511bd988b45d09a1642d95a4ff393282325b5f73d378ae401
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. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of numerous external links strongly implies a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.srijonihealinghome.com/fckimages/file/61558456154.pdf In PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a252aca1092---65371182614.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q9017ohhiaicmccf8ebqs4eeh4/migeboxafipoturuxuso.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/3830647153.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/88412351696.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb9354041---gujagepugemotonebuvetox.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/30986787128.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/6ca3b4f99dfdf1f333ec215b522cbe4c/97730550839.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/9998d6130665e87394a3540382dbc434/buworiwo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/65vmkh9qp636knujr7ksllq404/ralefoxelebefiv.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/76649118330.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6c7336f5---70149336028.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/66082424002.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b080778b---46196197407.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf61557b---59475855436.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/95422736470.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fogewakok.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/newawixanusukenif.pdfIn PDF document text
    • https://latework.cz/soubory/nilefijijasukebozefunefu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/260ab860dedcb68f10d97ac743b7bef8/79827178610.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/joxavumaxul.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5ao14590fn0epo20c4qauukue3/90251000421.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33e54673a4---42436705890.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d5d90bc50d592922c2848b3180154d3/momekemejibale.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/55746355144.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b34625f8a---12559426019.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/batizoreva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=arena+football+playbook+pdfPDF 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_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10560 bytes
SHA-256: d742081cadbdfebecdd3e9288700f250f01d0e5e11483f550f3ca473e96842d9
font_01_sfnt_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
SHA-256: e48b6dfb7f121cf9752bb8b758a5292329d9b44ce2937ac6ca4b01e743364966