Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d51dffb6fb37737…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 18:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 339648edfbb5519948073c7255bbf587 SHA-1: 69d42d1c8904437cbf1f8f719a35aa59165488dd SHA-256: 4d51dffb6fb3773799625c64580310d78f9a190cd7859796ed50434b9deedfd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve as lures to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hkmvbc142nvgqrdsqi9fpkuf97/vasadu.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bufunuverozelijopip.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vidamaluzerud.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/70869246357.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/21826616f97477397c46ce1bb2a42d40/rilaxomirujupanuzevir.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/63191586039.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/25121923845.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/ruzediz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8asqp9mjs1mbtubddenrnn2uv7/69290496556.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/31034594962.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415bb9d045---zufupilekavesufuzaper.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c61ec8ffb---mitulifemizesakub.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609435b846102---robafapukin.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/xemaguzavironasedoleveke.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/fifamifetamugomitulofu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb55c5ac7---95927090721.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/dezinid.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210616060919.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/94805143984.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/40519237867.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/91297109156.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/nitusixenezivibozenekika.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec85657992---18536065002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=come+sing+the+praise+of+jesusPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f7dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF7DC 18892 bytes
SHA-256: 5085fc18c48d853b53b86b6b55c616450276c41d49a4244d5ea63e170d6bc06d
font_00_sfnt_off0000cd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1F 16656 bytes
SHA-256: 7fe36864c95aa36b4fd75d913c018652308522700f36c9a943c3ea14519be843
font_02_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 11020 bytes
SHA-256: 6f3b06051f6b6b152f2eb5c066e93fe94794d3d00e76297b50c1edc3365d1f94
font_03_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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