Malicious PDF — malware analysis report

Static analysis result for SHA-256 b233fd7fe2967efa…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 13:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7aeb3fc058661da7c70925e713bf661b SHA-1: b3fafed28dde252ca0ca172f3703cf0be287b1ec SHA-256: b233fd7fe2967efa02dc2afce159c4b5d74bad94d6c3220bc7efef61e035f9ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=full+hd+aladdin PDF link annotation
    • http://haiqi-machine.com/d/files/wefexepora.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/davisuwoxukesuxun.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/29276786556.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25206122877.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/32108685413.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea682d85b---wirapebozipure.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fugidomapev.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1873c9684---30768817489.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kanakofomivupatogoz.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/79957828747.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/20450260982.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/10044594260.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/74697877044.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/901d0f4dc9232f0a51c123beab81a81f/5889143480.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/roxadujenijuxonidujugej.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/62122759157.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/fugobokip.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/41640566098.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/18mdjukjqfkqfpi37eepnllc12/lijavi.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/52902737839.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/79791678336.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/3745601221.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/75667308054.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/87193227079.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/safifudemomivoxozogajiv.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 17564 bytes
SHA-256: 005963c846ada7727dcb9ba70aac157f6b8997dab0e3c39cd44222ca5e906198
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 9804 bytes
SHA-256: 65dcfb1ddd42fe15603860a1a6091575799fad9c743004197a9ca5113fac4e3c
font_02_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1