Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2988b1ec8f89e1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 02:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1db22f4430bb421a8c83f43781ff8f38 SHA-1: df71af348ad3c4d31031b52b7d6de4e5a4898d93 SHA-256: 3d2988b1ec8f89e1e373330497ac8c2dba0a6b6bdb5f68e0223086ecd35b2f26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=how+do+i+delete+songs+from+my+android
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a6c51348---18500212738.pdf
    • http://intimatehotelpattaya.com/image/upload/File/xakexel.pdf
    • https://shen-su.eu/gfx/userfiles/files/zujitixuvisisoxakamo.pdf
    • http://flygarfield.net/userfiles/file/muwovodivazitubemeraj.pdf
    • https://tahubunting1.com/contents/files/44744454898.pdf
    • http://okzawidow.pl/img/upload/files/19248265915.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/94546488433.pdf
    • https://wittnebel.dk/file/75133030583.pdf
    • https://vibanghanoi.com/uploads/files/52851692614.pdf
    • http://unipsyclinic.com/userfiles/file/20210917133147.pdf
    • https://kcharp.com/ckfinder/userfiles/files/72339162120.pdf
    • http://rhondachem.com/d/files/80953462629.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lokeborupufawalopam.pdf
    • http://www.siposferenc.hu/html/3421606164.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fc02f0b86df5ea3d05cee406d4f722a3/kofor.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/gidivedijasefox.pdf
    • https://aokman-drive.com/d/files/vufebonofadem.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/xifotimos.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/kevafi.pdf
    • http://abogarestudio.com/userfiles/file/xonanoniwagil.pdf
    • https://eventaipei.com/upload/files/kirarabevilewudex.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e769148e509f006640812f01a4524a95/ropakobibute.pdf
    • http://kino-cosmik.ru/sadm_files/zikarusowekegefezuzew.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_off0000e03f.bin
f535e8c24776a6e1a8aae930673a08ceb6b3e542786d4c3bb7d4b9c147fb17a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 18236 bytes
font_01_sfnt_off00010f74.bin
69f17ee05a512b550bfea8dc44bbc9270b46419cb91b9240c5eed7b496c97685
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 10888 bytes
font_02_sfnt_off0001286f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286F 16792 bytes