Malicious PDF — malware analysis report

Static analysis result for SHA-256 7576e939397d116a…

MALICIOUS

PDF

94.2 KB Created: 2021-07-06 02:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e76a8d20a96a2ac05920d2b580e00169 SHA-1: e27c934173f234ccad6d72c9df0769f007650ee7 SHA-256: 7576e939397d116a11123f55b2fd0f0be69c1ae93d25f789be0333da72b5f159
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm hosted on compromised or disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO poisoning or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://synerhu.ru/uplcv?utm_term=what+does+tbt+stand+for+in+texting PDF link annotation
    • https://eobliecky.sk/userfiles/file/porovokixowugidexi.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/48005379435.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bidumosogufilamig.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/6498707297.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dkd80smsddmt2pl2qgj8la691h/6281685936.pdfIn PDF document text
    • http://www.siposferenc.hu/html/15236108410.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/26455233126.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/ruvofajukonorakoz.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/30865696698.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b0f2a246ce70305c97ec3c1af75cb2cb/kobinakigatosopi.pdfIn PDF document text
    • https://parfumzone.ro/files/file/rojiwawetoxivukarokugeni.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160716d407d4e2---51823203051.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/45490251187.pdfIn PDF document text
    • https://hoavily.com/uploads/files/noxisegobewisubajivelaj.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/7eprfcsdjkjf1dga5b90ria49m/77406844118.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7da601ae---21891498565.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/11624369161.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/zufajofusilusabokus.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/660f1bdf3627447984e7ede4e186087c/riforepuliwudekubapa.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/laparagapoxavumoburixilo.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/79741585140.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b238aa6db27---xoroxupavivijav.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/44bdac72bf01a9eed6df5e8c22f0996a/5497117798.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608189dcc5c82---porozitadagejomo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_02_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 17100 bytes
SHA-256: 08280d5fc938baddd4a1ced024288394a7fc1bf2736349de9e8b0366f41a4e2c
font_03_sfnt_off0001524d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524D 10820 bytes
SHA-256: e1e296d81c43860dc0dd90e81095d06a3e4e4a98f143c8804527b36fff7d881b

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