Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb138eb7a7e88409…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12059cfd4bbb67ecd488432f62abb64c SHA-1: 5a22f219ee4ee59dc8a56ea40d8b044dc45c7293 SHA-256: cb138eb7a7e88409d209894a2844c97d8dcb66c403e6cf84885def37010ba192
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=pokemon+go+spoofer+2021+android PDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/jelowebojonubaxomuvoteri.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/22700757476.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/tofekoramusakosazifapados.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zakirixo.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/40263782460.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/57bd36338369226d47861c2aa73c3fc0/68278278490.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7cfcdeb1---87907451720.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/54959191809.pdfIn PDF document text
    • http://talesma.com/E/file/13142797501.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16142c0e58eeac---78387127691.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109121148244900.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97385403845.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/718457308.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/97837206725.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/lasanotisevokasusetiv.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614280a9244e1---mibugusezonaxoxuzelo.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/xukupebuferutanajipujo.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/pawibuvofag.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nelatuperikijunuvugimez.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/95219420258.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/savovevuwegoriv.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/75022319549.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/15093772290.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/16304796261.pdfIn PDF document text
    • 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_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 11084 bytes
SHA-256: 9a05429f1ca7c68af002743451b3b998bca9e1bc37129b2d8e6d9d2568682b07
font_01_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 18528 bytes
SHA-256: 676eba1ea5f4d95a841ec4b48e00694fc53fb300a40f44b50eab7975e3808d7f
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1