Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed774a75f1107e5…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 19:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a92429fa957c4288958fcbbbb92ea4b SHA-1: 29d1ebb48766db6201188a4607467256bf53c4a9 SHA-256: aed774a75f1107e50a3bf9f029a47856f59fa5500cbb112e57a0a67917222121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the nature of the links suggests a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1aa43373---waguta.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/34879998967.pdf
    • https://cleaner.pl/userfiles/file/xuzazerugufoped.pdf
    • http://botosani.ro/img/uploads/file/voduzade.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/44298651009c435e79eb8c9b7ca51c8c/94545524284.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0bd6f18edf2c4cfe2830408dcda4eeba/74832796753.pdf
    • https://okna-stv.ru/userfiles/files/pedoninofuwime.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/baa399aec8be52b0cdb1b48ea276b688/17830583651.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6518ee2f44---witegujedomudimedafepug.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vpbtb8fqk509matvefihnpe812/32332671755.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ecbeb795---pipafeligaj.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cc9319cd---58474725013.pdf
    • http://goldway.jp/upload/board/file/safogefikal.pdf
    • http://domeinbeverdonk.be/assets/files/file/34429601573.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b996f4ed---45972663621.pdf
    • https://delcinfo.ru/img/files/files/lasataredik.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/261851125.pdf
    • http://nacyc.jp/Upload/file/talakovasifuguzipusiwis.pdf
    • http://curry-box-deluxe.de/userfiles/file/52769605424.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c6f15d0f---72979434542.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ee2d2099aba411927e54949dbf1f5358/gowutuza.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fdeb59b2a---rerulejamopukivukixiso.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b28htpqehrchdu9vturarqe7n1/sinusidofasadorokodivopok.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9916a5ae5---85382677850.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sunquest+tanning+bed+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a37.bin
450f1df28d2cb4d5603151ff07878f5a750c81a22958e95cd3abdbcbf08aeb95
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 17848 bytes
font_01_sfnt_off0001393b.bin
40f562d7807b32b8bf066a4f061fd72352d2dd00fffa4a692ce3d2a46627fc3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 10832 bytes
font_02_sfnt_off000151b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B8 16792 bytes