Malicious PDF — malware analysis report

Static analysis result for SHA-256 63985aa8750704f0…

MALICIOUS

PDF

89.0 KB Created: 2021-07-30 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 584d770d51af4f511f33417be1c88ccf SHA-1: ea2e468ef86f9b39ae317915dd27b25199405422 SHA-256: 63985aa8750704f037ce49be515c4d1dc0655dd4e4ea4ac68cd510a7a992d628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on potentially untrusted domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs strongly implies an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lucann.com/Upload/file/21195573569.pdf In PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cd0d1edf1f60b8c6b6783e62cb706bab/11554806532.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/5400309339.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/31425041411.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/46391021117.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zujejij.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608839edd912e---wipofumekob.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b133779d2f48f480adac3cdc1369ab4b/55581042795.pdfIn PDF document text
    • http://rld-carbon.ru/file/vetekito.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78c188397---wakuwajapomekemifunewe.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/juxurubum.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/fusijipotujolelatotox.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/70067187505.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609befe1c2fd8---kimeruratavorevox.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f0c78ed2---84489265182.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/16628857887.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/28955051095.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rubobujafud.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/84391519870.pdfIn PDF document text
    • http://attlas.center/userfiles/file/63905797577.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/64u1fpi1g77r0s6emhnlbsclh2/susapodatekaxitekujipolu.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/89227760087.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/287b4c035141f11ed188776a4c3affb4/noredifazawamujijinafow.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071915699ed5---zaguke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=brinkmann+gourmet+charcoal+smoker+manualPDF 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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 17400 bytes
SHA-256: 1823603f633fb919db9198f16cba21b7f2606587da9ace26df9a5255e7df2d40
font_02_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 10924 bytes
SHA-256: e8085842365ae82406089949f14a0a348d4e2666d8585b90b800aea61447c551

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