Malicious PDF — malware analysis report

Static analysis result for SHA-256 820243ef085b4cfd…

MALICIOUS

PDF

86.6 KB Created: 2021-08-06 01:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c34625428f8c8b0cd6368b45c8e8854 SHA-1: 5bb815e9a5a806b99931f915a94657a99b0d90cc SHA-256: 820243ef085b4cfd8427fc0bbe09b698fe84afb12b32cb2a395d66278d97072d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and callback scam. It contains numerous links to potentially compromised websites, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of embedded URLs and heuristic firings related to link farms and callback lures strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bephoangdung.vn/uploads/ckfinder/files/71236680467.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dtvkrsd4jss59k76klkdgmi18c/gasefuniforimuri.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/abthutj1vv7mokh4h5kk6j8gt4/31540911209.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/90707799665.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5533320f---sisinuragonuvewagaguke.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kanavokikiliji.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/kepufejomifanuwezusiv.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f6092b23---wuxatofikajidatu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee6beb036---sijulatekigeku.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954627c9caa---vifaluma.pdfIn PDF document text
    • http://unsersohn.ch/images/file/36654174289.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zagufediwo.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/nunovijinejasa.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/36076572483.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/9479333113.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/51862016314.pdfIn PDF document text
    • https://coatielectronica.com/files/genetiwe.pdfIn PDF document text
    • http://coumert.com/images/file/43011012043.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c1eba8f7---35503532697.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bec33729694---98975155705.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a1408ee75b4---gasanav.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/301nf58cioj2ti6s314q48qpi6/56369850230.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b1041593---fumaxalodagavevubajag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+you+lose+weight+on+metforminPDF 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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 17416 bytes
SHA-256: 43d371b9f1b379441d66816073d3d771860a5522da63f44a9e4f960c65a128aa
font_01_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 10992 bytes
SHA-256: 19ec2360a731ff30de16cf31b752f447961cc2a54f084863ccffc43f828c4e32
font_02_sfnt_off00013456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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