Malicious PDF — malware analysis report

Static analysis result for SHA-256 884c476d7c6f57dc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 08:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dce2e81e4e217c38006f0208fdc1ff8 SHA-1: 7025e6fb9f3da9b26d8ba353eff2b6c6cae2baf6 SHA-256: 884c476d7c6f57dcaf709ee1855fb54cb8cc4d6d9c33819c68e55501c3fbceb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Multiple heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://artattack-concerts.de/files/file/jalisajabok.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2c43c2f16---joguduzilegemejimuledama.pdf
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/supukekawufoxixagok.pdf
    • http://boonfagrandhome.com/user_img/files/zidorafomugopevivugelo.pdf
    • http://longvu.vn/Images_upload/files/zimevegamufukoxatiwonux.pdf
    • http://www.hgbehringer.de/img/files/files/69455613795.pdf
    • http://princeverma.in/uploads/files/gibapanum.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/kalujixut.pdf
    • http://clean-ecology.com/Upload/files/fafovexajemaben.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/15007233114.pdf
    • http://weldingplaza.com/files/file/fosusokivupuner.pdf
    • https://unicorn.mn/js/ckfinder/userfiles/files/fokopatudituzubutatojunu.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/59652768599.pdf
    • http://eva.am/files/f9c7540623556844.pdf
    • https://communeouchamps.fr/userfiles/file/93971392313.pdf
    • https://shian-jin.com/UserFiles/files/roxisavinatib.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/fimowigamedukemuvigegid.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6635aa72170106b8e4ade451d040ff83/vexofagafuvoruborifadi.pdf
    • https://sofupingame.com/calisma2/files/uploads/nibajelexupu.pdf
    • http://stressmanagement-karriere.de/userfiles/file/98962159039.pdf
    • https://bnovum.hu/downloads/64396499762.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/04dded3120b22ddec4f8cdf67c42eac0/74645929419.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=volume+booster+goodev+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xADE0 16792 bytes
font_01_sfnt_off0000c5f2.bin
1996501a505108bfcc2c36566bc9f568696f7fcecb6a7debc166f27ffaa5e312
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 15136 bytes
font_02_sfnt_off0000ec5b.bin
b6788d5f38b2a48d08d1acb73c990bc12065fd4f390f2ad4594899aa3f73970b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 17068 bytes
font_03_sfnt_off0001052a.bin
47bbc25080d4064a4cc36da678ed63713a28e85c621ae4fea6a90a12fbb4a4ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10908 bytes