Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e90fbeed8c4245…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 17:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11fdb88a93dfb121ff28f4849385a951 SHA-1: 1fa4a4f6432397d78013b42a93f49cf30ec145ce SHA-256: 82e90fbeed8c4245d0942272a8cb25161870614819f906d5b90014344c06c276
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links, some hosted on compromised CMS uploads, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lecostationery.com/files/file/83848560515.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03f2d4d52---tatamigepifodimebi.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2dc310bf---watozaros.pdf
    • https://loyd.rs/images/file/nepuwet.pdf
    • https://mimpiindah1.com/contents/files/65011534517.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145339cb8c2a---17719988212.pdf
    • http://urgentcarepb.com/userfiles/file/65861332877.pdf
    • https://briljant-maleri.se/UserFiles/files/nozajibufosodavore.pdf
    • http://prompol.com/media/file/8916737415.pdf
    • http://rialta.ie/userfiles/files/giboguwutosos.pdf
    • http://pi-consulting.ch/download/mijijuzawuruzixudozi.pdf
    • https://milosislandrooms.gr/userfiles/file/gimexatebusofupelefumezux.pdf
    • https://diarch.in/WYSIWYGImage/file/puzogufubamanu.pdf
    • http://snft.ro/media/file/26920414092.pdf
    • https://mosconi.net/userfiles/file/fapovapufoxudumodamo.pdf
    • https://www.alapan.org/fckimages/file/fapamenadeluzadasi.pdf
    • https://fivetc.vn/uploads/files/zitefewisisojaxas.pdf
    • https://gencshow.com/upload/ckfinder/files/xuwuxo.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161385e12d8ace---19238785263.pdf
    • http://problemconsulting.com/img/download/files/83754285739.pdf
    • https://praktijkbinnenstad.nl/file/tidewamidaxinikikisutup.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/gtp6fgu1mmcde9b1kou4b7p6si/nigibota.pdf
    • https://poojaindiangrill.com/nbloom/fckuploads/file/8440238463.pdf
    • https://agri-mal.pl/userfiles/file/remetik.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e945d62ee0---21775845379.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/41993038645.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=poco+x3+face+unlock
    • 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_off0000d18e.bin
3b7c4cfde0d97daa9b2edde412e94e076887cda11854afc21d7d1e73513fb54b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 10340 bytes
font_01_sfnt_off0000e91c.bin
41369d89cf66b6fdaa1b90446270f68616357d5c85bc48d8b20c017133d24caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 17184 bytes
font_02_sfnt_off00011598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 16792 bytes