Malicious PDF — malware analysis report

Static analysis result for SHA-256 c689c9a748e5d6d1…

MALICIOUS

PDF

85.2 KB Created: 2021-07-08 18:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0738ea80ed9ff895651acfa260a6b4ba SHA-1: 4b9a875e688f0bd33bbe5cd4eec8f8539f2d3060 SHA-256: c689c9a748e5d6d1f92c1091b3dc4637c6e227d37b96098a12b708c995e2ffd0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are hosted on various domains, some appearing to be compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://hometeamcorp.com/images/usr/67071650563.pdf
    • http://adamlegal.com/userfiles/file/52739810753.pdf
    • http://aimic.com/userfiles/file/26029297342.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fbfd3cd54---41323891141.pdf
    • http://gift-founder.com/archive/upload/files/75737652960.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4d47ea90018011cbe384487d793685c5/53753346425.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/187a0da61e97e41cdba5ec63494c5a90/kesuzasuzogefijukujovifa.pdf
    • http://peusch.lu/userfiles/files/pesusororumuzabetakutaku.pdf
    • https://local-atlas.ru/userfiles/files/vipek.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c880828f---loriresamakenurovik.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe070ef16b---tugap.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/909cdd6688bc3c1bfb1a2f23810149fe/76258905872.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd6a640997---vadovefivodelafov.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/48370466742.pdf
    • https://communeouchamps.fr/userfiles/file/65324147631.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/93f1h0ctgbab10r9fdsejte142/duvinurilikinitimepi.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/q8hedtdh00a9mb0fmreoft7483/75049901774.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca236445b---xokonopowunekusadapomipo.pdf
    • http://altiro.nl/home/tjerk/file/58229695354.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a7b55656730175d1e5cf119cd4c966d4/rozakawugisile.pdf
    • http://gandolfiarchitetti.com/userfiles/files/litipedosuxuvutoxam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=oxazepam+people+also+search+for
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd9a54db1---79406902579.pdf
    • 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_off0000e945.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 16792 bytes
font_01_sfnt_off00010157.bin
7d8c171adb751d1c8aed9aaf686dbbfa0f54a8893f0a744da5c5d18b0b982469
pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 17472 bytes
font_02_sfnt_off00012f1d.bin
08aed052bd010dd29ebb9f7a5c461d76b4a384ab17eaabd31877ae4be00d5556
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 10640 bytes