Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28865c851c2d009…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 08:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4928b6b4d3f0ddd34493e75478ae5e9a SHA-1: c2127d690e8e842a1336373514e80598bed537b6 SHA-256: a28865c851c2d009ac9f4e9c9353ebcb91c1a2fd528f096f1021e9f2ec0cb21a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits multiple heuristic firings indicating malicious intent, including links to compromised CMS uploads and link farms on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the presence of numerous suspicious URLs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611449a4a6bfe---37195788667.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/19faq51at155iu1qlg8i7roe23/dizunujerunapatazubi.pdfIn PDF document text
    • http://ustunongel.com/image/files/setixid.pdfIn PDF document text
    • http://grotech.in/userfiles/file/39604535481.pdfIn PDF document text
    • https://securitydm.com/slicice/file/xusudexe.pdfIn PDF document text
    • https://coluer.ir/documents/file/vevodubofidogemuguw.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/44982810175.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7c34ec2efa14907f250566aac96e9fc1/tavuludanarexogudiru.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/dilaxopa.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609879dc490e0---92484618611.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/ba6d2c0860b555a19fdf99a4c9895930.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dede30ddd63---231774556.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b4d5bd6b---42539422021.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/wiwibusupugupol.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/22930066256.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/59034841184.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77fa32a0e---bowomidenexazogupamatal.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/70057018044.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/87641096320.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/8296123521.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/simokutorovanabivexax.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/gejelojijajobipiganowi.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/toxejezire.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/pobixazujidi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1f69db295d9554ffba0df62f68efe72c/werobinapetelebe.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16922c3cc---29617607850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+therapy+techniques+for+neck+painPDF 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_off0000e57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11024 bytes
SHA-256: 48d4f4d90c9c7b8533053f8853321f8abffef820a18d07ad5c89b3bd6519b16e
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 16804 bytes
SHA-256: c585e498b11ba01073520212ed9794d4f21917f9dbc3c0919e58c9f95f330fe2

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