Malicious PDF — malware analysis report

Static analysis result for SHA-256 895569090c8c99d7…

MALICIOUS

PDF

121.1 KB Created: 2021-08-13 11:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af37a09202ddbad0add9e0bd955047b SHA-1: 498707dbc805cc9511eb3eb084c1872388756c69 SHA-256: 895569090c8c99d7b839894f0495ead89b6a4ddc1f7b658d3420ad810e085221
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the redirection through these numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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://beytarimcilik.com/admin/editor_resim/file/zawifigenijesikewijomomap.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/dojuwe.pdf
    • http://adamslakeband.org/userfiles/file/doligubejud.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/76ac622fcc039d0050b5a1470a52a657/gotazesipodorobu.pdf
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/vetabomugufekonovivebiz.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b4675e1d9b---99838534048.pdf
    • http://campbellelectronics.com/uploads/96581318875.pdf
    • http://www.annaleehuber.com/content_files/file/9716866221.pdf
    • https://minegociomiweb.com/userfiles/file/93090597696.pdf
    • http://macautemple.com/userfiles/file/44681722880.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/27ad583e396b50322625cc1502cd1c1a/35221372107.pdf
    • http://hebakotb.net/userfiles/file/97917492430.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a879a870---gupejemosawimafa.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7eec9077---77566744200.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c391d662825372c2c2a4e1b3b7c56be8/pawuwemovexofotateko.pdf
    • https://pima-alarms.rs/slicice/file/26298654441.pdf
    • https://giverny-bkk.com/upload/files/88692857303.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/39229522862.pdf
    • http://guojingmall.com/userfiles/file///worab.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160801fbde9594---sebivumimusowarat.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/c81b326025e05b0eb0b4782801812c08/76352555915.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df9a89ee588---sipagimipegividi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/07076aec29434e8ec107f0b547204b66/4773706503.pdf
    • http://moscow-vernisage.com/files/files/gifajidujamokoxovupufabe.pdf
    • https://phr4u.com/files/1903214393.pdf
    • https://holocaustresearch.pl/nowy/photo/file/91950911716.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+quest+to+farm+decorations+mhw
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015787.bin
9f42e0df0ecddf60bc383a0792bb6d23a4adaf7a034a35fc3b83bc6db910b035
pdf-font-stream PDF embedded font (sfnt) at offset 0x15787 16204 bytes
font_01_sfnt_off00016d49.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D49 1696 bytes
font_02_sfnt_off00017555.bin
28876072cc879df221de40cc59026d01ba0e7063c42ef0721cdeb4c90ae84d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17555 17520 bytes
font_03_sfnt_off0001a336.bin
62bd124e7a9e6cb1b2b5c1a56f6894e7409193f54da4d2d9583f9583b2e2de3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A336 11080 bytes
font_04_sfnt_off0001bcc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC3 16792 bytes