Malicious PDF — malware analysis report

Static analysis result for SHA-256 acab22fef94b0d76…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 06:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50a4bca3cb31985b24e094d48a7174d3 SHA-1: ee2b11233378ae995459008ec663562b7c1a8a19 SHA-256: acab22fef94b0d76e5ce2e1ae1647c8ddab1ff3969413692f333dad8598a6005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ML classifier and ClamAV, with heuristics indicating it is a link farm and potentially an invoice lure. The embedded URLs point to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing attempts that may leverage embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://abofahed.com/userfiles/file/18561874170.pdf In PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/walijujazetev.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vewixikuwisukivejodu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/penobaf.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f206072817---danew.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/wizovozogezetixanekuxe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/eqng6ruerb0m3loh1tf0dmo38h/67132797688.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/66163363769.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/katazufujus.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/37577358609.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/41bff4f8fc04c4e2ecb70a459e87ebda/poruxazomoribaveji.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/bexinotikoverofosep.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8cc3lcotibce157qq4qqbqlem6/lulenebulojidopoxilu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a073f153774---bimugabifezofo.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sqphrptqjo5skjhiv4g5pmveo5/xamatefubugoxike.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/4544127666.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8b37772f---zuxowiruwero.pdfIn PDF document text
    • http://hncastlecable.com/d/files/41166468237.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/adf07996cff20e5f94edf1a51b7ef2ac/narukenegatojuduwalezij.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/41918762909.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/54372885925.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c119a46038---sotapatesimasag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aurelio+stern+basteln+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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 19640 bytes
SHA-256: 9fd72e05237298a7a5e0d40950dbcab060223d6e8a783b9d646e2863ad831767
font_01_sfnt_off00010bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10712 bytes
SHA-256: d4b438e9ab1e7bb1538ccfec691f302cc5668468d988eac0dd9da1d3dfc53b3d
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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