Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b10b933cb868f0…

MALICIOUS

PDF

88.1 KB Created: 2021-10-09 10:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ef7f561b7d34bc2f5e840e3b5ac3dd0 SHA-1: 7da48a85497d36294f77ce3b2a6c4d44a0770d89 SHA-256: 28b10b933cb868f079d020263cf7227fbad469b9d15e793de74a68eff1554461
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://globalfeedindustry.com/upload/files/rotupe.pdf In PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/55a35348f37674b9ec08c44f9d8caa38/78326284716.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/gotuzaleronumu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/j2m71ojsftmq8nja266s8u2a63/19144181036.pdfIn PDF document text
    • http://jadeite.ru/images/file/jewekovitemaronuvikise.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lusezunosuxiguvesevil.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/68204358718.pdfIn PDF document text
    • http://matras-devison.com/upload/file/56276798412.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/68566172354.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/bokeseroviw.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/nagidinebuxiv.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/99133070964.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/nedukurefakibapapeme.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/fefozizezegaxezifo.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/momovurazumilumij.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/9176412397.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/7926122480.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210913102704.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/rifazapokadalazisu.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xuvetuwiwadu.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/pozunajikazakorimoxada.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/sozolinunufavudusodivab.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/mofewanavowodeviredaz.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/82612802562.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/865315e646d73529d8406a8bb66f29bb/kodometetewajubix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=realidades+1+capitulo+3a+answersPDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10960 bytes
SHA-256: 6d8623760a43a0fa946e94a7a0a78dc06942ada8c5b939082ea2b8d1e58b68ba
font_01_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 20924 bytes
SHA-256: 4353e5735acb138f6137ccff824c72bd16c2c9c9b2d0370bfb3ff68ac2d43efe
font_02_sfnt_off00013aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1