Malicious PDF — malware analysis report

Static analysis result for SHA-256 3580dc1ebb3ee3d8…

MALICIOUS

PDF

94.4 KB Created: 2021-07-22 15:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4628c9128a4bff1e552443492b2b5367 SHA-1: 8d4e8895b0ccf42ffd71207e2954a71fe735357d SHA-256: 3580dc1ebb3ee3d865352c3431826fd4a7e228f0e94351781e74229f0f89c1d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://harissarantis.com/userfiles/files/96100682710.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/140f28cfa7bacc1ff3fbc851e76919bf/rejuburenadineximuwu.pdf
    • https://invest.pl/userfiles/file/fakibapoj.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/14a4c5b5d61eb8f21337d9e1707e0dcc/8597067955.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c87aa9b4599af250c718223ce4e8907c/lututifowuravagu.pdf
    • https://ietc-oman.com/userfiles/files/vumezejilepidenobed.pdf
    • http://ashioke.com/images/library/File/xupafiwak.pdf
    • http://www.romanschatztruhe.de/img/files/47432514597.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b828d284097---42696555135.pdf
    • http://ceroki.com/image/files/11680636065.pdf
    • http://autoscuolemontagna.it/userfiles/files/55884159452.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756b1076052---ninoxose.pdf
    • https://pui-vital.ro/msg_media/file/53493567292.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/nidebixanos.pdf
    • http://naosgym.com/userfiles/files/vopote.pdf
    • http://studioguidobarbieri.it/userfiles/files/79945164298.pdf
    • http://lnaixi.com/userfiles/file/20210722083735_718326941.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4de4e90b3---nusirekesolofuwovi.pdf
    • https://victorybear-info.com/userfiles/files/titemotoranizuwoj.pdf
    • http://rakkhunnursinghome.com/user_img/files/30299817708.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd625ad9036---tikenovutitutiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+save+separate+pdf+pages
    • 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_off0000ea7d.bin
47c4d81d4e24d1fbbc6c7766feaf4bb6a51a9357800c220c86ce98ae1c0e4491
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 17264 bytes
font_01_sfnt_off00011794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
font_02_sfnt_off00012fab.bin
e2c41d2555916ffb5ae158607624e064673173203734551591c8cf211629b9b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 10572 bytes
font_03_sfnt_off000147bd.bin
ccea135c70595d8a4dd5a98726b1a9a51640aebdb3d3eb887daf99e25d750752
pdf-font-stream PDF embedded font (sfnt) at offset 0x147BD 2852 bytes
font_04_sfnt_off0001535d.bin
dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
pdf-font-stream PDF embedded font (sfnt) at offset 0x1535D 16084 bytes