Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc178d7915dfc66…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 07:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87bf28e26b89932f9e8d272b81cb0574 SHA-1: 57141c31ce024d8ca0a3f542682d6fda7db607f4 SHA-256: abc178d7915dfc662b57d4377856d5e3bf75488b3e92e4bf59300b84fecd3a8c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zhodnoceni-penez.cz/is/images/FCKeditor/File/kejimemavipegufefezik.pdf In PDF document text
    • http://rutka.pl/media/upload/files/0fed9f576314c8886be017c2b654b571.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/kolarufinoner.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/najawojeluzimipo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f53527e0b5a8e5d9d33bd05643e579e2/kawexejupametukawopoluvix.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/memufopalanusolebase.pdfIn PDF document text
    • http://katachizu.com/img/news/files/55713606495.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/wexuretudimijelakod.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eo195tclt1jc610njc46gbjn5e/37037264568.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fudalejugomusimofire.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/fegetikojixugiwe.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/rinikozilavewelikap.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/javuwudetosiwamigapiv.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/59833922736.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70352118458.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/54684154545.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/38650576570.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/81537930148.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/87359837647.pdfIn PDF document text
    • http://www.moyekolodin.com/files/88596033019.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kimavurobepijelubimire.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/dojesebi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/dewopubagulopunonowu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1seji41p05e640ffv90jaaqiu2/52529789942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tamagotchi+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 17460 bytes
SHA-256: 13b3e6ea20fad5e7db9842badcf5aa5390aa4b8000e5b5296927bbd5a3268366
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10468 bytes
SHA-256: 3036cb7799b7045fe07258864c35b2e51b5a10bd9244fc852b27ec3d509b02b8