Malicious PDF — malware analysis report

Static analysis result for SHA-256 7812344dfa0144ec…

MALICIOUS

PDF

95.1 KB Created: 2021-09-01 13:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83ca9443f613f5eebdf6d879faa6ac0e SHA-1: 399306f5fd9a21cb2254b94116bd038ea813d543 SHA-256: 7812344dfa0144eca0dfdb654cd2e4f3b02da74868a7310aa55f31d0fd11b8d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple compromised WordPress sites and disposable hosting further indicates malicious intent, likely for phishing or malware delivery. The ClamAV detection and ML classifier confidence strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f4b89e4afb206deb157c9a51b5080b4f/62477556555.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/79416149053.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c879debda0b---mopazodavasakizegedoli.pdfIn PDF document text
    • https://777mto.com/contents//files/xajuzaz.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/wewibezizamedatulok.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/71012305485.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b6690d110---11898580690.pdfIn PDF document text
    • http://apothepharma.com/upload/files/lemolutozakikali.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/xixilijolunivezuwuva.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pafuzibidifunali.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bogatonorap.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/98981689184.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7nrb5d4n3350b89420bo4fgsru/liwomomopokozere.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/64763580466.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/70a4d58e102d23cafd5f282801eaec55/54815778845.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607119d3df2cc---mukit.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cdf57072a---jirasajuzasurapilazub.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-16/20210816193044826375.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/39082372557.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/zosovopofumadalud.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ffed9182506eccc32b3b3924104ac4e6/77505209052.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/xofitegazaluzimemefowe.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/394368e72391ad24ab1aa1d395e7aa8b/23746650525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=prince+of+tennis+episodesPDF 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_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 10408 bytes
SHA-256: 267d425dd942046b5cc9925d8fd0e8dc2018eb9ea49ba915711b3961b087ca59
font_02_sfnt_off000139cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CD 19764 bytes
SHA-256: 06c1f02b97bc5a46cadb2059635fb51e399c090a24210b01b56bf348340c5459