Malicious PDF — malware analysis report

Static analysis result for SHA-256 717376ac72e2a459…

MALICIOUS

PDF

83.2 KB Created: 2021-08-19 03:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22c3fe910257f068b6eb7360cdcda499 SHA-1: 8639755a01d9d44e26e9b789d2a54947e1bfa53e SHA-256: 717376ac72e2a45997449d0a57acd7c52348e2a397cf94b14809d248ad20ee55
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The heuristic 'SE_URGENCY_LURE' suggests the document may contain urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vienkiemis.lt/app/webroot/uploads/userfiles/files/tipogixuwap.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/23358215060.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/5834b000c9de9c460adcde34c0e0bdcd/51161744509.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/b1e11td9vmkd2a3r0trkinfg2o/88921931187.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210812220025907834fs38o.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be210acaee2---wakuvamix.pdfIn PDF document text
    • http://arslanemlak.com/E/file/ribelopime.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8r8gu09mj5st93fcddpqbvov2d/rexalawewovevirukuwuviw.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/tokuxawinojubofifizinifu.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20309385851.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/22758624969.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2121f409b---6929077320.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768250e5b7b---47975741532.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/19591591267.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0d6b9067---62002543382.pdfIn PDF document text
    • https://airbays.com/userfiles/file/89990834898.pdfIn PDF document text
    • http://teresachild.com/upload/files/34091050238.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wifukusikodataxiwejubomun.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/filufuvova.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/dewenatasawekabivibuxi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ncbkcbcue5rovrvof2i1q08sr3/povenupixogisuzaf.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/84644403782.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qoce2ep9mr4h5l9ji3lv155jnc/wobeni.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/femejivimed.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/200f32527d50f95934e4c927c426da4c/6171061517.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/88271553426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=1st+year+online+admission+form+2019+karachiPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 16536 bytes
SHA-256: ea30aae7c260091c492d49a8c20b39116a428f9dff1128258228b4a0c6a36abb
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 11312 bytes
SHA-256: b20f083442dd0ef6aea33aacd19d6d5c84b86982950ef0e7592366b3475b41f9

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