Malicious PDF — malware analysis report

Static analysis result for SHA-256 af20b73dae759eaf…

MALICIOUS

PDF

79.1 KB Created: 2021-06-29 00:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 288b69fe302ff082e12a11d587dea451 SHA-1: 933147f804f2d1fb46d1ed72a11014f6daeae93b SHA-256: af20b73dae759eaf1a962946657316635bb3ead387a6a3b3a94e2856bf1620d2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/68f79d3e96395ca3dfb779c0300a7873/41586695889.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4k0ungla535bc39m13238bci0d/44035514931.pdf
    • http://palyavalaszto.hu/teszt/upload/file/62519610511.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ls5hr7q5u64g0kl51q1npdfqr6/xazuvudixivukefizebiguv.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/463sdmf7tb7grju6cg0mvo9s8m/50597978076.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed35d41d1b---xasug.pdf
    • http://peaceinsrilanka.lk/userfiles/file/perewefuputolilutumufi.pdf
    • http://amexeuro.com/an3_Uploads/file/jefitud.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/d19f3746581523f3b334d5d04467f3d3/1838908120.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/682d5028b9c8c036c8c8687bc94fe68a/loduzoriromofavapinus.pdf
    • https://stancijanegrin.com/UserFiles/files/doruzekagirol.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52b547300---nabekepupi.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce259ea4ff---kigozozijav.pdf
    • http://vishalaholidays.com/ckfinder/userfiles/files/pogesaduniliminulukaxad.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/31035405563.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/envik35drp2cmaqkv1p8f5i2m2/bemulabudenujezabafurudin.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d4359728---58811088758.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42460c0e5---53101888610.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c173c575aca---xewofabapiduka.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1d56c5d2---74787350763.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee567bffe---84721567562.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/amv0fq28ssu34s7psrejbh9d4h/63319806960.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ff2o4087qo939ujnfr2i8ia61i/25939659086.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b68b3c86bf59866aeb6638b1e496aaca/26324226782.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+powerpoint+templates+chemistry+theme
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19b.bin
fe981838b641f98f8beee1ae917773a9b8d788e1f7573d9ca169baf7a998c442
pdf-font-stream PDF embedded font (sfnt) at offset 0xD19B 10816 bytes
font_01_sfnt_off0000ea67.bin
853d51afef3b82034f1642faebc117c21ca1e327d9bfdceff716e3c4ce211ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16972 bytes
font_02_sfnt_off000116d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes