Malicious PDF — malware analysis report

Static analysis result for SHA-256 131e58ce8c117ea2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 17:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09bfa74b7b6faa9047883b87bd4f547 SHA-1: 783c0b3b86d2658763e987ccf952709aee638774 SHA-256: 131e58ce8c117ea250f21a143541276a321c76100d7b58560f1e371a55873571
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kleinschaden.expert/userfiles/file/26508439241.pdf
    • http://ginzaoakland.com/uploads/files/funeteto.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jd1grpfus8bf12i5vcsj702a37/67385981995.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b518db0d73---fodabofafuxawupos.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4a8573de5ee4d8aaeb18fe24d0e57489/72604213296.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/delilaraforegoziborosupug.pdf
    • http://hcviet.com/img-phuctri/files/26607220594.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/38n29t0ho73q7s65o6gdnoj0je/73127658540.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad26e252527---jegoni.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/q9ljqeialec7lpgsarrv8aao34/dasopuxidipulego.pdf
    • http://ipublicity.cz/data/file/15418517994.pdf
    • http://odessawa.com/userfiles/file/38913182254.pdf
    • http://linza-market.ru/upload/files/10477888406.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0916984c7---begimidenavipatuxomew.pdf
    • https://bettyloupaints.com/userfiles/files/bafujupalofavowajam.pdf
    • http://connectcontrol.net/files/userfiles/files/tadenuxoboradorakikikazu.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bd0b1386c83917641ca85dabf1ecf854/geligubanisoreme.pdf
    • https://srsatta.com/ckfinder/userfiles/files/femepe.pdf
    • https://letstravelforacause.com/miet/assets/files/biwada.pdf
    • http://splhardware.com/UploadFile/file/2021080608084873499.pdf
    • http://norilskgu.ru/userfiles/file/54763591704.pdf
    • http://phonphangschool.com/upload/files/migedezaxiv.pdf
    • http://pvvc.cz/files/witomofotovowom.pdf
    • http://i-harmonics.com/upload/files/laxedow.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+does+it+mean+when+tree+roots+come+to+the+surface
    • 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_off0000bac3.bin
a6d1428f49233b729f5dcfbd4b89bc047f567e19ac8fb6c85265eb1277d8e45c
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 16484 bytes
font_01_sfnt_off0000e52f.bin
512d277a70887d9ad8721a3669c37bfcb504548f754b1e2dfd2610ec62850149
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10876 bytes
font_02_sfnt_off0000fe37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 16792 bytes