Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4e4ad541c04d85…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 11:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c0055f8274e3c2110cff617825cfd04 SHA-1: c19988bf6e77e9b3aba862fc5af8d8f2e8d52f0c SHA-256: 2a4e4ad541c04d850411df3b7e3726763c6601a323c3d9cd46affe3c65858a49
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=http+www+supersu+com+faq+how+to+root PDF link annotation
    • https://dobski.pl/userfiles/file/tironirugezeriji.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/mapivimi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1rhlhgddqap7pe3bogaqb40doj/50714249463.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdfIn PDF document text
    • http://kahasat.cz/data/file/timulizow.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613c763f87d12---xavomajumidulezagawut.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161339e42749b5---4160252391.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/97573737810.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/nidatoriruwarul.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/jijejene.pdfIn PDF document text
    • http://bwc.lt/i/24063199278.pdfIn PDF document text
    • https://tessuno.com/upload/files/6136672027d47.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/detefiwupuxezikugivuwid.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613a142284ad4---89080925424.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/57885867016.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/nuvulevuveredejewaxawa.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/94203261919.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/3220647680.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zetudifoki.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/komuda.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/15006263144.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/79696628024.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/63272346132.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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 10824 bytes
SHA-256: 50289d81952697d0e91da86907778ca0bbae5917bdcc2aeee2b3466cbe22286e
font_01_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 17708 bytes
SHA-256: 0ea866902e1206adeda8e380f0ce116d383beaa9b6e6af4f456a62272ca79924
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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