Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa4a39f8a2528af…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 21:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8519d62b1bd69ef16229ef14ba583401 SHA-1: 3993e65e7f223be2c1e77de88ca18fe447da43c2 SHA-256: 7fa4a39f8a2528afec480946e9de2bf74056d1c4abb3f69e7423ce91d39fd42c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external links, some of which point to compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5731e9307---43672239835.pdf In PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tipuwewidiza.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/lafipekezeminesek.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wovow.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r800plchplediqevt1tdrh6icd/zesizowexiwevogubovaroto.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/mekaguxurapelumapegilab.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce91e3965---2832680140.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/30112939729.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/fasanosawataj.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/49368990351.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840464d964---31391777586.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/buwekijovajabol.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2avq50llukrq2i27k9ehve88qi/bolosujusojugaw.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/fukame.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/xuxosunawasaxupor.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/12821324009.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/weruxadewe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d230eb9648---buruwafik.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ddo5fem88v3bflif4mr7dalm48/83704442859.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/32556808360.pdfIn PDF document text
    • https://successalpha.team/upload/files/kimarefevabepad.pdfIn PDF document text
    • https://fuoriscena.eu/file/tibejonufided.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jiguwevujoletenufomi.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8j0mv5e2q7o4mmbq0gac2mrnd/xotiraxuxefepis.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3f45bac260f094658d1bdbff8d6f14d/78049311086.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/vqu9btqfes3k22l1jg3aqsim66/jozalogatavejufepavefosis.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8ae5b5f64e1deaac27c5480c33b0a37b/xikirujubomowerub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=disegno+tecnico+tornincasa+pdfPDF 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 17540 bytes
SHA-256: 7095cb160421a4108ae5b24bb09514e8eab89b36647e1d09af16241660c636b5
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 10752 bytes
SHA-256: 0425b9fb894dbf27edbde73431b06103953cfe5d187922803aa78a2ba7cce4d6

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