Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb07634519c688b1…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 09:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7878c1b2abcd600c20abed444660dad2 SHA-1: 46f303c743b98879eae0f13a9e54df56e829f1b5 SHA-256: fb07634519c688b1155606eb21ffbc883a79b61b5c912d0a30a6855b0280767a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef7d6026c6---derugivujonezogekokevuga.pdf In PDF document text
    • https://saunadlaciebie.pl/userfiles/file/30998262540.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/jusogax.pdfIn PDF document text
    • http://air-ned.com/uploads/files/pixedodasoxogili.pdfIn PDF document text
    • https://labelmarket.pl/data/file/xitoriparisu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/10487352900.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/buwuseliveguvijetijazimej.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/84762384414.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/guvilawasobuzuzus.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/13634875556.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/valagamevuke.pdfIn PDF document text
    • https://okazionche.com/files/wivutapajonisabumagusopek.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632736541.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/kamobimibewenusipofusi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/n4s49n2o5s3qo1bg50oe92u85i/vigaj.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/wapabajunusulokuboxodudo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc6a7bc001---janefunetebenizuk.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/19533659040.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8845af291916c84d88e0e921331fe69/53664450119.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/84789906132.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/jopenevulu.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vofogejaxe.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/42382639749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+short+screenplayPDF link annotation
    • 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_off0000b394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 10456 bytes
SHA-256: 4b329400a4693ff04441362a5dce9ec215837c23386df6ea0022803c31fe3ec6
font_02_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 16328 bytes
SHA-256: 3f3ee787efe3e3dada80610718702e22546b77ff466913582d382d3374d31fbc