Malicious PDF — malware analysis report

Static analysis result for SHA-256 351364227f39f793…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 14:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0586b47be9a91de9ddfef7f84ddeca77 SHA-1: b3e028705e6338cebe4241610deda1ac616362e0 SHA-256: 351364227f39f793779a0c2995c9023e7650571fc43a7c8e18506de258c08201
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://cructi.ru/uplcv?utm_term=change+app+icons+without+launcher PDF link annotation
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429486065f5---18531729870.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/fuvureg.pdfIn PDF document text
    • https://harom.ro/files/file/tujunug.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/votaburaledadokolu.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nazovukogofogudu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/79965751428.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/44191218484.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/ribezodamusodivav.pdfIn PDF document text
    • http://sdes.in/uploads/xumimu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/sisetaxogofom.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ferifubaxedofo.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/nejup.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/84655083804.pdfIn PDF document text
    • https://dptech.vn/uploads/files/94726686434.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/woxolutuxomewunox.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/20847673701.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/xebobeveweperisowoguvew.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161344c4155cc4---lotazoku.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/57131407072.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d439b136ac8b660d7c1065cd0ca78d5e/95101733511.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161446ab17fa22---78546637679.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/10737590207.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/vivixixojizulowitokogiku.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/46772700038.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/porawitazafoziriki.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/mazarabilesu.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10872 bytes
SHA-256: acb23287a9ae249829f27187f509e9959ebbaf64250b2452a39250dfa606cbd8
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 17796 bytes
SHA-256: 3d20a0641da6167e447ecd5acab68cb07012e57d87b6f517cf8099b5380b4192
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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