Malicious PDF — malware analysis report

Static analysis result for SHA-256 b759353c0eda7133…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 09:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9f1caebd6fb50faf11c9f79195add869 SHA-1: 41da8367685e3e320b4e4ffaa94af8658c6b894f SHA-256: b759353c0eda71338431f3a3b1d42ceefe4ece65eab105b670c3f28a6de7c25f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure are consistent with callback phishing or tech-support scam patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 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 https://drafthe.ru/uplcv?utm_term=although+subordinating+conjunction PDF link annotation
    • https://dacinsara.ro/fckfiles/file/vebugedemelewute.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/wupitimivipugepuw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6ec0b14b---suganulawikumijujamatanu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b000752673---xipunetufavezixarumilera.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfc9d2599---lasenagaponatawiwaxudalu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099adb241fe4---dobumik.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080490a4da1b---xusivowomuziwekam.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa390c884f---pelopowizukazut.pdfIn PDF document text
    • http://954move.com/clients/4890/File/30556082997.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61ca541de---nekularasuturab.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/guterajabipowulenexamor.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/30552927616.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/saxumowesatupesoropiteri.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e60e3a6469b460293462bf44f46ac3f0/52176676742.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/ditaxevezikupamupanut.pdfIn PDF document text
    • http://apsons.eu/files/file/xulimegawad.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/visegoxodegosiguxupinov.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fea29835d---64613412732.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4e532d1e---73271036658.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/mopimukub.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9462b59d---42206993999.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f1e220857ad1e5b51559764cb563ae0c/dozuxizidaxumedojokakisuj.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 16936 bytes
SHA-256: cc968710e4a96ad578a196a57d7ecc78cc7de71528be5bd862411f6584748fb8
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 1952 bytes
SHA-256: 956a59ce88d16d18682f88e8006d486c34ec2890eecfa153a08c3a0b5244bc99
font_03_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 10868 bytes
SHA-256: 254cb3b1bf9ab6113bf5ff55292c9b59ba5f31349ebdfbd9647f987a470e9d06

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