Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8910513beb7434c…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 17:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 985769b2c764accea69daaa325d7d165 SHA-1: 281e7ab67ed141a99d53a0f9a894b7b69a275b9e SHA-256: b8910513beb7434c6789c5b421de66ca2bd376d4e4ebd2a3f47cf28be8571eb7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=cs+android+download PDF link annotation
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/41858501370.pdfIn PDF document text
    • https://revive.fashion/upload/files/66117532958.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ca94b339e72c590b6c79965575c2d1f2/64452747694.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/66903969466.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/76415679906.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021913828595155.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/molozamufajobubadux.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/vodowis.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/28775340030.pdfIn PDF document text
    • http://spiregene.com/image/files/20210920_035319.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/79671612676.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/20045144274.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/niridulexefeze.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/29986574764.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/20799162581.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/40116357152.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/monuxe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614994263c38a---tuwotilevozisim.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75550add---jizolerobilofogaxub.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/bafikorififad.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/kivomevajutelopuseluwiwoj.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/66330232492.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/katusenejazalun.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/89223574254.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/vibafudulalu.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/6750648094.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_off0000b14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 10128 bytes
SHA-256: 9758922664dbf090525caa860fb17ce96f7aa1d88aac51e123fb4b87e91c92d4
font_02_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 14428 bytes
SHA-256: 54159de7e546cf00a9eef6c54100aa0a6235e47d7e94835404b91be82cc4fa34

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