Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00009f214d76385…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 16:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbdbce168abbc7a88296b9505d2403ad SHA-1: 27c728b834bb1e948a15b2ad0683f63bbd22880c SHA-256: c00009f214d7638555861d2f1c74f9c94d3329f49aef0aee0f2c8979b3fdd326
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. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://inwebjor.ru/uplcv?utm_term=xiaomi+tv+stick+browser
    • http://chocoenglish.com/_UploadFile/Images/file/jusevigiwemafajebun.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/93f47e1bc5f0bc9f75d98c2f1fbb2b6a/91180642775.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cca5d45c67---zaburorotejelavalulu.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/mafimemujozise.pdf
    • https://bushregenerators.info/userfiles/files/fonazagevipojel.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/folufadurodo.pdf
    • http://rcot.by/pics/files/zesatubagew.pdf
    • http://jmk.kr/ckfinder/userfiles/files/7165931419.pdf
    • https://elitstroycraft.ru/source/file/52338448788.pdf
    • http://ume.civilkozpont.hu/uploads/file/6357567692.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/xalogovugumagokigoliv.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9d5a8ab6---98579141731.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fb7bf4d0f45ead1edaf3153a9a296221/xofeponanowilunogoro.pdf
    • https://clubkdo.fr/img/pics/files/2081985072.pdf
    • http://qishuochem.com/siicea/userfiles/file/vapawutunoxaba.pdf
    • http://poddertradingandindustries.com/userfiles/file/raxagegixe.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vujive.pdf
    • http://kxqcgs.net/filespath/files/20210917182433.pdf
    • http://na-bytecek.cz/UserFiles/File/reruduleg.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/78246993267.pdf
    • http://flamefitnessstudio.com/cewit/images/file/redejunulosime.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq50ufij6lsgcg9hb9kefom1j4/4860583031.pdf
    • http://bakoca.hu/files/file/sisaf.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/bozapuzakagoradafoluf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A0 16792 bytes
font_01_sfnt_off0000cfad.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 1820 bytes
font_02_sfnt_off0000d838.bin
2948f791572322d9f48c813be64e0acdd1ed3e525ab4812ba8bcf386f516b575
pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10632 bytes
font_03_sfnt_off0000f0b8.bin
eb1007c2704535a7cb9ec4aad8f1b998cdad4db299fc338790b83e3388ddc361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 21288 bytes
font_04_sfnt_off0001262a.bin
e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16128 bytes