Malicious PDF — malware analysis report

Static analysis result for SHA-256 75583ada603da6cf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 04:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c7b957e2774cb0f3ea65581d4a156bf SHA-1: 7d559f85b7716a452ac1ae6b6e4d43e049c0536f SHA-256: 75583ada603da6cf9d54f5ad25c148bad3696a73bc116f0f59ceeaf8396ef03a
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://studio-rivetti.it/userfiles/files/75623785129.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/lolifodapib.pdf
    • http://clubselectionvoyages.com/images/file/31074145736.pdf
    • http://aatmicscience.org/asuserfiles/file/7966720024.pdf
    • http://studiomilano.eu/userfiles/files/mugonutemiji.pdf
    • https://datawire.gr/files/files/482880641.pdf
    • https://xulynuocphangiathinh.vn/images/pic/file/wipidurumoj.pdf
    • http://nsfeed.com/_UploadFile/Images/file/kulelotajinezubu.pdf
    • http://azseal.net/uploads/userfiles/file/91607059937.pdf
    • http://tokstar.com/_UploadFile/Images/file/39831745048.pdf
    • http://terminsk.by/pics/files/vagoj.pdf
    • http://mfcpavpos.ru/file/wilam.pdf
    • http://htbestcomputer.com/media/ftp/file/meluvegepaxefekolome.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135953847acf---sotobajivamomi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89501dc07---bijulelebedozuniv.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5utr8b3v2691c1hl6io64v0j15/gigibodo.pdf
    • http://quocteanviet.com/img-chamthi/files/nerasubuwonavokuse.pdf
    • http://adimhukuk.com/resimler/files/renisedufogotamemomavex.pdf
    • https://sportcity.bg/webroot/img/content/files/xokezinejadutijitinez.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/roruvujilojaluvuli.pdf
    • http://tnslib.su/userfiles/files/84757061333.pdf
    • http://cleangroupbd.com/ck/upload/files/39777145857.pdf
    • https://chung-pei.com/userfiles/file/93078661095.pdf
    • http://fzsvybbs.at/userfiles/file/dazepodif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=past+perfect+text+comprehension+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_off0000cc63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 16792 bytes
font_01_sfnt_off0000e47a.bin
0227f464112c086c38dabe58696dfb3d5f9a5225f3d9b1f856fcfd86789b0365
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 10944 bytes
font_02_sfnt_off0000fdb2.bin
0ca4be5a5e3a2b6e6f2e30514671f4e7fdc64108877b497f601d569716953e30
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17556 bytes