Malicious PDF — malware analysis report

Static analysis result for SHA-256 853dcc1ad89e558f…

MALICIOUS

PDF

89.8 KB Created: 2021-07-20 10:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f92db35424dae45334102a43da5fc87 SHA-1: 78831b67cd3e1bf49bb403b0b528b5459fd84845 SHA-256: 853dcc1ad89e558f46c99a10fffc800126d8d19b60048a38037d80998999c290
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to distribute further malicious content. The document body, though heavily obfuscated, indicates a potential invoice or payment-related theme, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • 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.
  • 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 http://hitecds.com/userfiles/file/76588904071.pdf In PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/65ifb8b2vrfp0enjtcfks64u1p/6064079344.pdfIn PDF document text
    • http://slsnn.ru/content/files/67196552227.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/22994971888.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/kogawa.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8851305254.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ffcc3cca2ba78920f6afb8e352fb4137/genom.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf2a4aea3---1931336669.pdfIn PDF document text
    • http://minhanh.com/files/51417663244.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9cd2ac8b9bf4b2d0ca661b59494fce04/53144264408.pdfIn PDF document text
    • https://songhong.info/userfiles/file/sekexaxeg.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/mugatukozijufatud.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083104cddf8d---91551992273.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/jupesuwesegutarozipar.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/78228279776.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6158797cac---32997049732.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1584f4ed---57293843930.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/14428067852.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cb982d649---semulawipudijuw.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210714_0FAC47BC7FB7B3C1.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sokope.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/60016140429.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i6o3jud6a7sr3va92d0mfiafpa/84474622047.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vekexajokipogedopat.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m4tf191838t972lb0kocv6ijv1/xolerubowifivozoreba.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfee0072e3---70554082960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=authorization+letter+for+bill+paymentPDF 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_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 10848 bytes
SHA-256: 2531a85067eee9faf32afeba601c5abf3b917eaff38d622a317793543ee391bd
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 19868 bytes
SHA-256: 2569bb53807b139fa05a9c62075ddcb40412b4aeb5f27450afc96ef80a8c5348

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