Malicious PDF — malware analysis report

Static analysis result for SHA-256 f482cc6c32fe8f8c…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 23:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb27bf1e7ef4b04d99f9486037fbb5b8 SHA-1: 2277b05dd5d8bfe0e2096496ce89459e813112b2 SHA-256: f482cc6c32fe8f8c9a15c9e41edb84dc3bea3231315e45bffd16609cdff5c3d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=order+of+battle+ww2+cheats
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/905e0a6a4102cc6c363a9f3f8381f74f/17443580158.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d46cb0224---98127469419.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/863e430f8b069dc22ed290ded409248e/pizaz.pdf
    • https://snqrsl.quebec/upload/editor/file/16516543584.pdf
    • https://gotoko.com/cmsv2/upload/files/dizokexelodu.pdf
    • http://steakclubhn.com/campannas/file/79393487812.pdf
    • http://cheniou.handysociality.com/upload/files/dumoburelitifezu.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/11002451559.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/72676079170.pdf
    • http://jmk.kr/ckfinder/userfiles/files/87445314102.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/kororepodafezipalixiz.pdf
    • https://steammining.com/userfiles/file/wuturukukijapanitelujox.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8205d46c---32986999535.pdf
    • http://namuvaldymas.lt/userfiles/file/60543287271.pdf
    • http://csc028.com/userfiles/file/20210913035624_27mgkm.pdf
    • https://matkinhantai.com/luutru/files/fazojaber.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/97115322557.pdf
    • http://sjanzee.nl/file/lesogaserer.pdf
    • http://forspeed.cz/ckfinder/userfiles/files/fakijanaduraje.pdf
    • http://orzo.cz/uploaded/files/46084058474.pdf
    • http://khocabien.com/uploads/files/lipagafibapusajujogojofa.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/79007283348.pdf
    • http://www.og2c.com/images/file/26569941766.pdf
    • http://retailcop.ca/files/sonekoxerexutejunuwemajob.pdf
    • http://sieuthimaynhapkhau.com/upload/files/virekufofenekolek.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a727202bff1f3729470065753d6d7d6a/26810187114.pdf
    • 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_off0000daa8.bin
52ec9b660c8f77846d77c977e9a037b64c4233d581a6356454784f81edb40312
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 19008 bytes
font_01_sfnt_off00010cf8.bin
bc25b184926a7b58a43a04b6f63d1acabec8d20dd7b1a973c89124c9f7a4140b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 10748 bytes
font_02_sfnt_off000125fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16792 bytes