Malicious PDF — malware analysis report

Static analysis result for SHA-256 890514c1eaf34580…

MALICIOUS

PDF

101.7 KB Created: 2021-06-26 03:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddde95d6ebc5eae5f46261a77a1eba4c SHA-1: 9e62239229a93339720965ca477d288c0170dbd3 SHA-256: 890514c1eaf345800385e7bd827b9382fe4b90001a491fa30df05181b2279f29
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised or disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://asckhn.com/acskhn/userfiles/file/wozorazegosoluwejekuj.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gr8grsmkcph6cq76tpqdvoo3n3/37591042765.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/75cc336f2916464f20d3e1970b001338/wakofamite.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/59654846296.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/9639373606.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/55381879513.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eksbrqudnsnkqt0qrhhb93lj2q/wakije.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e020be4c63---sajoxixoguwa.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5f991c3a040a8c98e10288a1f7914eb8/41646890876.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/768448853.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8149d43232a8b93ef8228153038a6780/45324911156.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d8494a80f7d0adbf331f9fdda967af91/15579711128.pdf
    • http://lungshingcentre.com/userfiles/28459878650.pdf
    • http://dokumsuzgec.com/userfiles/files/baxilorexikamutaruzewa.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098417799d3e---62656499233.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/45ad02db3b2690857cc19f6eeb24d2ba/11962127827.pdf
    • http://bulmarconsult.com/files/xidunegatogopimumasef.pdf
    • https://b2cexpressdemo.com/userfiles/file/siwodubakifabimovezumav.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b060cfa4a50---veverawazasabuxo.pdf
    • http://cipetbhopal.com/webimg/files/damunipanukuf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9500989f---gotufuxonigubagivusi.pdf
    • https://natyabio.com/uploadfiles/xezavizutebuzufobuxigove.pdf
    • http://ahkjt.com/upfile/file/72222596817.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=basara+2+iso+ppsspp
    • 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
font_00_sfnt_off0000f958.bin
0fb13998fdccdba0ffbfd6602c967891ee21b3e65742700254325ddf44afeba0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 17496 bytes
font_01_sfnt_off00012ef3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 16792 bytes
font_02_sfnt_off0001470a.bin
b58fc689ef6571bd4ccfeb92dd7e9fd722271b2c5451bb9cc0e379798614fca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1470A 10040 bytes
font_03_sfnt_off00015d7f.bin
005913e42bb39dea7510b8215d115be9439804d09b6d0a6e812acec5cfac9ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 17016 bytes