Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbafb3a6f77482a…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 15:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7ff5c164c8885171a79871388e5ecf52 SHA-1: cc5b41162443731487d83c0232ce4396c49450e8 SHA-256: 8cbafb3a6f77482a5cb9e842f95898ed41f7e203d3855cc2f1952d28287b4d6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://asirakademi.com/resimler/files/nezadutesiki.pdf In PDF document text
    • http://thevisionkharj.com/userfiles/files/39120328719.pdfIn PDF document text
    • http://hodori247.com/uploads/files/83281906911.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/44387471540.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/98168999381.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ead5f2a2074ef546faae99fb979d1562/22661701467.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/jomudepedemajinus.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c753bc45a3---23147296072.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wodinejozugigekafaxati.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab267042a7---zipizotanemesujavivoj.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/94974071819.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kvjikmpouj3sto1qt1u707mp11/55349588341.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e4085f8f---pebezilobaji.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/3340188042.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/nesogo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bece4527bf---85244772979.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df66b3e6e---miludogozivub.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/5327048969.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/58bj8j92q0m6pe23qd4v7uj6ro42igf6/42392419510.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/13931546462.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zelotodagovezeluvolu.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/xefigegovakeribubuloma.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dgag1vetgggg5ui9a6iig6b7f7/tawitasikujobedovekavuj.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/43743620256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+blue+hairPDF 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_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10460 bytes
SHA-256: e60a000a0cd9258ee53743b88060795240e3add7301d51cc6165ef07b98e9015
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16472 bytes
SHA-256: 1f4032641c0309d4ceb6fee1ee63e391a61721b5103eb562266c1a3ba3f743d7
font_02_sfnt_off00012d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1