Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e70aac8833f488…

MALICIOUS

PDF

93.9 KB Created: 2021-08-17 02:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fad27c8c77818dc1370b23f8b671946b SHA-1: 648c10086ba7fe31dbc3758c63bcfb6c5a505d84 SHA-256: a1e70aac8833f4888a06a324dc6bdfd2d8bd6d643678621fd1dc8cb37b67fc89
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e24e2a3af---75923138258.pdf In PDF document text
    • http://intergeored.com/upload/File/6023381356.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f9e7299319f289142c228ab419734110/vuterakorip.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d320b0b787---41247990651.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/labunuvisinifutedajiv.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kavawobif.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b001e9bba69---61813461888.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/jodisurunididiz.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f95885eed9d4c425db333a938c4c3909/16750188093.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/77295704513.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb9e47710---levopanejipug.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tnmg8cfhiejm8717qinh44b5qf/nawemumutafufizefu.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/9450420106.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ro6s1ballnjbu191ko9gl4khi2/22848933597.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/23896020942.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f0146757f07---dosixajatamipivumomutes.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b6d0bb6cbef689fd56214955faaf93ce/gesorobun.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/nesudanejamivomijafuwutok.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077e747c47c2---87228044272.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210523025838.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/veritogu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3entrsmogi1vf0rqt45a19vi2n/najuti.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/75086669868.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/mejusirokibegukoxotu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/77091015598.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vegilojunakodosixekanes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sims+freeplay+mod+apk+ios+2019PDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 17296 bytes
SHA-256: 97a4a04ab4a7f876ab451b8360c2f3dbb46633b2602f58aa8c72ec7695498404
font_01_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 1728 bytes
SHA-256: 81f277ff9ca9cd818deb606bd01635905cfcc4a95b7bb16f78738b4b14071178
font_02_sfnt_off00011df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF5 16428 bytes
SHA-256: 23191a20989a09959b2cbcbcedb805b598ca26499a9d836ac043174a76a4ddba
font_03_sfnt_off00013452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C69 11200 bytes
SHA-256: f3524d9a614d6f2e4e800148f7641d989ac01228c1ea940af53a00f6a7294997

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