Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01f0e45568fa127…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 15:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 331a7f03a8af1505cc810d376e5c2c77 SHA-1: e0fa38be4dd4b1845da0b7acbf249abf51f47097 SHA-256: c01f0e45568fa127111af84b4e3fc4b7a31c1eb1d1a360c26076015021b738e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are hosted on compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The presence of embedded URLs and the structure of the PDF suggest it is designed to lure users into clicking links that lead to malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=how+to+grow+long+head+tricep
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1c07e073b05928b72872a6a7b9f1f998/jajikuvor.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/v4msle02jsou845lv1oqlq4vho/majozanerov.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c877153ca50---supaxiz.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/jagowonuwolokuj.pdf
    • http://cnc-soustruzeni.cz/files/file/danavetu.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a140487513f---welos.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a43c6b5d---70358027755.pdf
    • https://caribemed.com/userfiles/file/64810904245.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590d86a2a3---63709816131.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e824c2a217---68417007756.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/00ab6594e9d01756c778982aa3624c41/biredovexewubogobetadag.pdf
    • https://ms01bet.net/contents//files/zamal.pdf
    • https://lemanssrl.it/file/saxetunag.pdf
    • http://adabaskimerkezi.com/upload/file/40194158541.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ff624c643dbba52617428eb2dcc8b00/fonipi.pdf
    • http://ylplj.com/ckfinder/userfiles/files/bazav.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607499fe34e46---70469631841.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jevujawowozanopiwawov.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80fb41c53---gujebukumixo.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7712741e3---48001438055.pdf
    • http://budohurtsa.pl/userfiles/file/fuxurofalimekew.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44ad97778---mararow.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_off0000ef53.bin
d283d5ef1ea9dbf0ebdc5f3178075b7e13c2fbfb47c860e23e29f7eb197be26b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 17076 bytes
font_01_sfnt_off00011ba3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 16792 bytes
font_02_sfnt_off000133ba.bin
d5e68ed5670c63f9c95daaa1dad35e31ee9cbf9bd69f8f9457a049c4b86a7b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x133BA 10700 bytes