Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e067fb0befea112…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 15:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f7446e308b97cbd9ff7b034a99dfa7 SHA-1: 2b5e41c496b88bb8489595e3f441d892d30fedcb SHA-256: 3e067fb0befea112ac1c777a096145ded6e7abed6989b5dfa82fb7037f9228b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, many hosted on compromised WordPress sites or disposable domains, suggest the document is part of a link farm designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=find+internal+storage+android
    • http://www.keizerco.nl/userFiles/file/5324057342.pdf
    • http://suriyedostlukdernegi.org/image/files/mujanedagipuvuvunofemuras.pdf
    • https://efsanepin.com/calisma2/files/uploads/jodadedebipaxezoperi.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e10c070b---76894233621.pdf
    • http://kenhuffbuilders.com/userfiles/file/davipobixitubibox.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc59fe2073---98866004049.pdf
    • https://stabiactiv.com/userfiles/file/90227946901.pdf
    • http://coreaad.com/DreamDataUpload/file/79556640367.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/pivof.pdf
    • https://konteshamamotu.com/userfiles/file/nudanunoganero.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28037369948.pdf
    • http://eyela.kr/uploadfile/fckeditor/file/gatosipadolujagitegolas.pdf
    • https://cmottaviproductive.it/uploads/file/kijakotanepajedazenevu.pdf
    • http://ekhoron21.mn/uploads/files/97608613083.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/53336526123.pdf
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/zones.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/13516926859.pdf
    • http://dogomanhnghia.com/uploads/files/gaxaronerid.pdf
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/xibitufazoru.pdf
    • https://yesilkoyluleriz.biz/resimler/files/naxopitotijipuwepewibali.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569873dcc2---40539656365.pdf
    • https://cheesykeju.com/contents/files/68438269373.pdf
    • https://mmoxx.mn/userfiles/files/27487215628.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_off0000b228.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB228 16792 bytes
font_01_sfnt_off0000ca3a.bin
24f8e88e6f8dd02e3c41821fc3fa9bb2d88c12b9bb2d3a7e33644e899a8a0d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 14196 bytes
font_02_sfnt_off0000ede4.bin
6fb03e8b4c6ab65b2fc8ccb529ce12e4d741d5bd362a2d51712836cd527c0d32
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 10400 bytes