Malicious PDF — malware analysis report

Static analysis result for SHA-256 427db331ce739347…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 13:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e0396cc0212eaf0d55293d26ddb69f0 SHA-1: 0e95e3b529536f6098454e55480546bd0d7b1a47 SHA-256: 427db331ce7393477f5ab73977ec09ba22930bf22633c0a5282c964125ca1617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains multiple external URIs pointing to compromised WordPress sites and other domains. These links suggest the PDF acts as a link farm, directing users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=puppet+soccer+2015+apk
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5787603eaf1b09863745932a5c3a7bb3/gipimerozujopogibet.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/fvm775513en0kb40pdvuctis3v/90979760199.pdf
    • http://esejsc.com/upload/files/35655035114.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/58217249095.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/napol.pdf
    • http://autoachtercamper.nl/userfiles/file/luvosanifikixevomo.pdf
    • http://rotarybrescello.it/userfiles/files/mewutasemagu.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/diret.pdf
    • https://777mto.com/contents/files/82927015278.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161486146c898a---sanozabigiperiguluxufe.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/eeeb826fbe0c820e7f857e7e9a2afe37/47435916318.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xabotokif.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/jamaxepexofob.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/42077964433.pdf
    • http://syarmarka.ru/userfiles/files/33772680403.pdf
    • https://cfbadalona.net/ckdata/files/jikukobas.pdf
    • http://runhouchem.com/upload/files/seran.pdf
    • http://maroba-zirndorf.de/file/renanabulajurepiwu.pdf
    • https://landtop.com/filespath/files/20210914110029.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138377e18881---bixevozokurawepedegav.pdf
    • http://www.eatvirukai.lt/uploads/files/8375063092.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/33630463506.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_off0000d011.bin
c524327ed1de516fa6471d75a8e8d7032d4464382372a535b30c60b3f571a5c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 21000 bytes
font_01_sfnt_off00010749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
font_02_sfnt_off00011f60.bin
75906f463bc93286b291fc04507900bbfc8e195e713df95aa3d2290e42dd707a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 10744 bytes