Malicious PDF — malware analysis report

Static analysis result for SHA-256 f255b0751b4b4c5c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-24 05:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8be5d29594bd8512e25510e99a22df4 SHA-1: 74ed0704efa97d7d8aeaaf791ed7a082e5fc196c SHA-256: f255b0751b4b4c5c7d746f296add9ef6dc6a778bfcb72a7f64f9d7378c4da176
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bakersfield.thepokeluau.com/uploads/files/3943928943.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xizaletiteximuxuwugip.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/juvugemijowebuda.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/117467940.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/xavebedefepuxibukugi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/2656589694.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f024bac191bbee71ec9a7ce9717137c3/23396345712.pdfIn PDF document text
    • https://cncunse.com/d/files/77296434356.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fabisugataz.pdfIn PDF document text
    • http://esen.life/userfiles/file/86144911295.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/momarivuwumute.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/pesatunowawitatezi.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/94680978445.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfcc47b5---54036977789.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/patirirarotibe.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pedebaxudosobasuvo.pdfIn PDF document text
    • https://kawanmto.com/contents/files/29663203464.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/nusuzojalubasunedawiwir.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1c900ac17---lugifumoluserodaguz.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/talimedowalinidanuzugag.pdfIn PDF document text
    • http://hbaoge.com/upload/files/wokusevedazepez.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/56409023551.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdfIn PDF document text
    • https://euchebnici.com/img/file/puripaziti.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/fetubum.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614214bab6eff---redojalelovorinirudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pressure+volume+temperature+formula+chemistryPDF 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_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 10920 bytes
SHA-256: c1068bf1aede9b9430c8c53f1ea0b821bff0ece6e9c6e2d6b78de0f831dd46ff
font_01_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 18684 bytes
SHA-256: 0169ce8316f8e9ed8a068c51a7d45eb22531124779dd2ee2e5ed32191bcfb604
font_02_sfnt_off0001338d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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