Malicious PDF — malware analysis report

Static analysis result for SHA-256 9104b99d1d7eaf4e…

MALICIOUS

PDF

78.0 KB Created: 2021-10-02 20:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49a1a87493401f0f4d18e397bb295bb2 SHA-1: bc76db4c6659ad0993f9dda363b61089c560a7e1 SHA-256: 9104b99d1d7eaf4e325f780e2dc2b3f141dc2ac839396b41c30822f663a903e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=what+is+secondary+double+glazing PDF link annotation
    • http://mixline.ru/img/lib/file/65038071414.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/sumonafunagodepigijusep.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/wazibirugijivoz.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b96f71df40f29f673fb06f78234723c3/suwexeludodezow.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/04502090967b8d2cb170feba990562b1/vavilitetozep.pdfIn PDF document text
    • http://gabortech.com/admin/file/mufobuboduk.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/23258185092.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/5255732420.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/87786529157.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/55632013430.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/48912189142.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/marudolugome.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/49797356766.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/60454522336.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c31142af1---11245842256.pdfIn PDF document text
    • http://krzeptowski.pl/file/94111793464.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/tugeporetagapopifaxu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/rafabejuzudujupamewoleja.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/28810618027.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/63014476960.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1b41372412659e355b44bf1493389634/14574384574.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ea1eea521---duzolakolepotiboluguka.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/toweramemi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/telubikimotobiwokumepomu.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/310279023.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB454 11056 bytes
SHA-256: af1f9bb4d20da7b886fe6684a5d82bbc8aaf5e65117880b55ef9ce65043146e6
font_01_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 17724 bytes
SHA-256: 55a183fdbbebbe8865f092441629d74e0afc2cd7d40c1b71c8809bb7784c59ba
font_02_sfnt_off0000e89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16076 bytes
SHA-256: edd152700b9b265bb9e54f52a7dc801aaf81f0b40a10c16c69907bfb04f48466
font_03_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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