Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a0fba228f1cf1b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-23 16:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f540b61f003388fb8f0c61e7a0263d1 SHA-1: 5d24e97602202f49da83f1239ea4d80e5356b696 SHA-256: e5a0fba228f1cf1bab12adcbb5f8c3e923e20ff35047ede1a1ad700acd6716c8
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://truhlarstvi-strakonice.cz/files/file/natoriborimoxalabamib.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324825d3f6b---48766581367.pdf
    • http://erago.cidees.com/uploads/files/nenipifibogevimewe.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fi2dnj32kjc06okcrfegsjp89h/pinavoperivisesisifokamam.pdf
    • https://distriparkbotlek.nl/userfiles/files/wukoripet.pdf
    • http://topbuild.net/content/xuploadimages/file/zobefanejovimorulukor.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tubobivirabowo.pdf
    • https://champion-osk.pl/userfiles/file/depalamokifel.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/95553988534.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/pogerasotibalagoko.pdf
    • http://videocycling.info/files/file/54117915023.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec1859417b---97847195433.pdf
    • http://montereypark.kopanramen.com/uploads/files/lofubakefozazuvejomiguse.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/700566d0680c124193837b8676ced913/mosawatotaxi.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/30493430115.pdf
    • http://lexxyin.net/files/fckeditor/file/wimewivum.pdf
    • https://pernambucoimortal.com/imagens/files/dalol.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/16934546566.pdf
    • http://commune-bourre.com/userfiles/file/53203518013.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/83965329620.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613843d08acb1---zogad.pdf
    • https://hospvetcentral.pt/site/upload/file/limurobiwebakixotez.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/bijabizetezaka.pdf
    • https://tectrongim.com/uploads/file/towoxumotuzer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+tv+amazon+apk
    • 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_off0000f8e0.bin
817d23a4b75e8ae596805aebbdf505c93ed1c2ea31f20925f586a51cb3c29474
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10404 bytes
font_01_sfnt_off00011070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
font_02_sfnt_off00012882.bin
8539e753c23ea819be8c73250a5e640fea6242c41a40b4e20877ffa917bed3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 18440 bytes