Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c44844de110cf2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 08:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b39f569e9562fafe1c0f8f2abab5fb2 SHA-1: 457b837faff29e77b8ce80d88b63d101eb543a27 SHA-256: a1c44844de110cf2957637d78064214fc362374d53af1a995c457117166c7a3f
156 Risk Score

Malware Insights

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

The PDF sample contains a link farm with numerous URLs pointing to external resources, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or phishing for credentials. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the document as a deceptive link aggregator.

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 https://sgotomotiv.org/upload/files/51792309437.pdf
    • https://fajndoktor.cz/images/file/files/79626501743.pdf
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/pumupebepep.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/63622922866.pdf
    • http://synerfreight.com/syner_upload/images/files/gujevugufemizu.pdf
    • https://ajansnigde.com/resimler/files/vapomuwir.pdf
    • http://ha-sine.com/d/files/82266836310.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/1219cc381cefd5c8ab84bddaa210c254/pixokarekedadibugezejeson.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133de4243ab3---78418765227.pdf
    • https://hsse.cl/files/96052298746.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xojaletutibiwebebe.pdf
    • http://ingatlantv.tv/userfiles/files/rapifoferedejizeketo.pdf
    • http://misr-consult.com/userfiles/file/95696229809.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/42642036492.pdf
    • https://rugsinc.in/UserFiles/files/29107862513.pdf
    • https://31app.com/userfiles/file/86878585257.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikagoxasogax.pdf
    • http://acudrved.com/ckfinder/userfiles/files/38472042367.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0c9991d2---74377342506.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/sukomoxalujuzuxilapofusez.pdf
    • https://alstar.uz/images/shared/file/37597235848.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210902_C108C0F497ACC2E7.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04f74824d---44334404047.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357de8a4a8e---34365915815.pdf
    • http://homeopathyhongkong.org/files/8058478191.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lg+tv+remote+app+android+download
    • 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_off0000c62a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 16792 bytes
font_01_sfnt_off0000de41.bin
322cdc7d9520d9d2d4a522c6bdf3c449f30542903f4f2342c077f1868822582a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 10676 bytes
font_02_sfnt_off0000f67e.bin
a172c6bd130c3432483e33057ced9594320c3343c5f488dc8beaa67d990e389f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 16364 bytes