Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cc3397ec52e7bb…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 09:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a7e1fc3a81d8a0180fb4b5d756158c9 SHA-1: a61acbc760105450925a9b5ad39ecfca30bfa2d2 SHA-256: c3cc3397ec52e7bbb331ff0af0a0c7d236acbc711b3f6eb2d7a9a87517698f63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the nature of the links suggest this file is part of a phishing campaign, likely using spearphishing attachments to deliver the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d82c9f1a7---12259728469.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27946ebb5d---wabisef.pdf
    • https://rainbowfurnitures.com/files/files/81386578247.pdf
    • https://aradovan.com/userfiles/file/8051107612.pdf
    • http://ciskmv.com/css/file/97298501403.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dfc6940a---jedozutegoluf.pdf
    • http://ankamet.com/userfiles/file/27117450568.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9130a9c65b---1221130110.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ba1d17c51d596c24a75f0549aedf3e79/kobefirinupokoroj.pdf
    • http://pospatrans.cz/UserFiles/File/27162070435.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p3g15n3fsmg4fjplc7mtrd8lfo/62626479708.pdf
    • https://arhometutor.com/userfiles/file/tesipezuduwas.pdf
    • http://bwc.lt/i/92444888394.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9vv8m0fr2vbi3t8jj4okiqhgp3/jaganomipa.pdf
    • http://meble-tk.pl/userfiles/file/89260924300.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210614_210111.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3a9c63f51f717ec713e31ee38f9132e3/90152662491.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6779bba1---jetavux.pdf
    • http://www.aadhar-interior.com/userfiles/file/6693217891.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/adf18f7b6bdc04980872dc22750f4763/tuzogopemafod.pdf
    • http://caythuocdangian.net/images/files/xebakak.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/16154c8611b6de7b72220d10c2e0595f/pezegulugopamevose.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d8b875215cf1a0170e90c00c1033b7d0/miforuroruxixamel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=broaden+your+mind+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011ea9.bin
e8a89a863e0bb38f70052bdd859eb0578d7459029af5dcd9a1f5b3e53da7b2b9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11EA9 18764 bytes
font_00_sfnt_off0000f1be.bin
6d2051aeb3aea962a366f93c3864c35102c9dd570a6116c799b0b5fd263c33ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 17196 bytes
font_02_sfnt_off00013d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16792 bytes
font_03_sfnt_off00015551.bin
b17b92a5c835bfb62b2cb3e1ecef92e6d4ed70908c00a77198b44fd9a676b910
pdf-font-stream PDF embedded font (sfnt) at offset 0x15551 10548 bytes