Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc44e2b3efed88…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 19:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d85b65a5613f522ae7bb05d6cd52e57 SHA-1: a2149fafd550160bd0cf5bf376427152965ac07d SHA-256: d4fc44e2b3efed88b7cc90af7c622c4828b41e8a113cabffb76ec4c4ec9e535c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to manipulate search engine results for malicious purposes. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_URI' heuristic suggest the PDF is intended to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=getinsta+hacked+version+download PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd84ba3450---vawudazufixivuzudow.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/wexirebadikeganaligexaf.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/53218980174.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/21389519223.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///43195319388.pdfIn PDF document text
    • https://euchebnici.com/img/file/sokonutuxujopotogud.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/mizofumojojoxedosiveka.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210919025500.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c914a3cb56b1d7d41aed0663642555ab/tukawovojunuwupidanewazu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mijit.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/67913838529.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/10003015255.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/rireme.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/89368464293.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b149f4ddde---xubawera.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/fovexasodipozaku.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lajikasokudekuluv.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/84251334159.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/93610950752.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/615991499.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/88ce804ab2ebb595bf0c05b2b8a075cb/47108410037.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/87437139198.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/wizujeliwokukutorujub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16952 bytes
SHA-256: e1757044b036abb08a3335418e0d2b7d58a41414d82c4895bae0e2c92d227cb4
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10752 bytes
SHA-256: fd44247a0f2b00012beb626fa6013342480740e2220cbfda1fce82e020756ec6

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