Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b26554e979d80d…

MALICIOUS

PDF

89.3 KB Created: 2021-08-09 04:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8ada3c41f69ba7c4bcdc09e4b2b6a26 SHA-1: 351242f24a7216ed55feefa837cc277411584c0d SHA-256: f3b26554e979d80da90c437ed4a1115d2e598d973e3e8fbe319a634a1acf75cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a compromised CMS upload link indicates an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection suggests it's designed to exploit user interaction, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://abrasco.org.br/ckfinder/userfiles/files/mavanidutotisasixedupena.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/21105643555.pdf
    • https://tumsad.org/img/editor/image/file/dudekagalalomuwij.pdf
    • http://annandale1963.com/clients/69704/File/batizufitaxa.pdf
    • http://birzebbugastpetersfc.com/files/file/8376289858.pdf
    • http://royalgroup.at/tmp/foremigidove.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ca4abkpov5aobs04vdmhvulfp0/kigesijuwasunobeb.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zofivutimo.pdf
    • http://esthebel.de/userfiles/file/32259526189.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/94395181946.pdf
    • http://madmojo.com/fckupload/file/mewosizix.pdf
    • http://libertyquad72.fr/userfiles/file/dapekizaxane.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d86a686150---2066234130.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/886d3c640b9074ff65633060bc357c8f/tusiketaruf.pdf
    • http://shortguycentral.com/ck_uploads/files/filoj.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2b9e412a4---20080389578.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d5c0a819ba75450e6712b4c6e3717659/77103315058.pdf
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/lafugema.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/fofipeguvadizaket.pdf
    • http://beijingxinzhi.com/userfiles/file/20210511035417_1421939799.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/efd769a0abf939e176bde34a07f58a16/zojijexidapoj.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/gu8s1qroeu60hd77vp3rpr7j30/wedoxejezuzidotesedag.pdf
    • http://cn-daomeng.com/upload/userfiles/files/b1b1a2d9bb7e15841e25bc38d44f1b92.pdf
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/e72e171c85e44824bf69c5a6cdca9e36/24595582491.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+hunger+games+mockingjay+full+movie+free+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_off0000f3d2.bin
b2ed57c5a5d7fb55a60156569fccc99e537f19ace47b6950a53a535b19dd246b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 11376 bytes
font_01_sfnt_off00010e3b.bin
45677db6a3b42c9bc767698a4f42f4fb1dfc4f394bb4808d7ac78c97bc7d5c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 17420 bytes
font_02_sfnt_off00013bb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 16792 bytes