Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c62ab137b85b73…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 13:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c4dbdedb9c905aab3102d3571a6a1f5 SHA-1: 9e2e1ba78450247a6273fa071f50479510298a97 SHA-256: 37c62ab137b85b732634cfe8b95b28accc1d774ad1ad362a0f2bf18be27ba726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://envisystem.com/upload/userfile/files/bekepofegodobofojiju.pdf In PDF document text
    • http://sushimura1.com/uploads/files/bibujozalezedago.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/vebogiruburuwujuzaga.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zozomisizevugutelamasex.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4081bd378---xagilad.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/26348496738.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/43380230366.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210901071631_fm2upo.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/1086517767.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/59793163498.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pikomox.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zatikapitutugidizogijesi.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210912_132735.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/16558951500.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be463b37c---mobodananajagiv.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/bufinur.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/riguwogez.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/vonapijejuvojew.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wajulesidatefud.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ujktr1bc6g40tub35qebemvdts/30436674032.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/61537647367.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/85763885522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=live+cricket+streaming+apk+for+pcPDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 17512 bytes
SHA-256: 61fff304771868223bb8d2b4ea9a459b5a594450acae3b278f3721a092eed59c
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10892 bytes
SHA-256: 4cc7b6d4417c7c22b0b045c24b6cbd428a958f84406a443a4ff0adfed681cd95
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1