Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f738ae0a714702…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 12:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aa9f5c996a58476da61e5afa81c0695 SHA-1: d63edf9d215a7ac64a7d13e34fca2253c332dbd1 SHA-256: b3f738ae0a714702d21b29e2aa2d0a17da6afc649a458373c2415ffa1a3cdb8f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://tiklatakip.com/calisma2/files/uploads/42160003376.pdf
    • https://livermore.com/wysiwygfiles/file/1184731313.pdf
    • http://holidayinntorino.com/userfiles/files/89236993006.pdf
    • https://nomortiga.com/contents/files/kubezimez.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/146ba98d7b3a28ca079b7ea33aa6a484/61675965317.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/pozagixekurikovogunabokoz.pdf
    • http://i-physiology.ru/upload/1459461206.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/93400374839a0a1ac7732d2c20745047/metidesimok.pdf
    • http://ankaraeksioglu.com/resimler/files/limoravewudarovute.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740dac9f68---zifopur.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1oqm9gmfde36t1496de3q35m0v/66575935087.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/vadizul.pdf
    • https://amursvoidom.ru/media/files/79033685518.pdf
    • http://pivotal-technologies.com/userfiles/file/bajogasozowujexidemusu.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/rosinotozudojepaz.pdf
    • http://metzlerranch.com/userimages/29134060257.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/97003491029.pdf
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/pezulabusogoxekugi.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420846aee08---pojixujaniwujumumevex.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/najerezerixagewovigebok.pdf
    • http://neoneofytou.com/ckfinder/userfiles/files/6069977359.pdf
    • https://amursvoidom.ru/media/files/pobefusabixodebider.pdf
    • http://slsnn.ru/content/file/55040089230.pdf
    • http://fsgzb.com/upfolder/e/files/20210904172145.pdf
    • http://dsagco.com/Upload/file/27524655225.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=access+clipboard+android
    • 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_off0000cbbf.bin
fef9f9c90f3ef8abdbf30174e62dd5e5c82ce3915fd6b9e75a461b304eb07dee
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 16604 bytes
font_01_sfnt_off0000f6f9.bin
e7475291d930c6b1b1b9b24428b294c4534a8c88cce3ea89593e9a0b815ce5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 10528 bytes
font_02_sfnt_off00010ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 16792 bytes