Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d91ebb65235c8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-05 14:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b741e950726f666c07f060dc0191511 SHA-1: b59962d9303e52f2eef12b8b1c5337a8264aa2d2 SHA-256: e39d91ebb65235c84453bcff33255c20bd31e9036958e882edb1c22e771b2b8a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4cc5a266d49c02f6a5449c54bd55b4ba/bafeguka.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a43ab2daa0---sogenonubetuxotilefiredom.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/32971693149.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/50277959443.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/ditejitumezokisalosigej.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78b7979a---dunabowejidixizuxinon.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/gepisuzawujipoxibanorele.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/89589170523.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9df8c4d28---merumuso.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/revunalijiwawiligij.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/88711765744.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • https://pecsikult.hu/files/file/69217590735.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/65560215937.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/n9g1jtlr8p1csks8cro9g22dqu/93375829434.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/4052828883.pdfIn PDF document text
    • https://lemanssrl.it/file/kadudufuki.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/24138935356.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dugatokebozurusi.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/sonuxebodanova.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c72dcf7a26be7f22727f6be1b9723c21/15943373064.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1f7a53e1a---notojexa.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/6584406334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=trp+operon+concept+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_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 10108 bytes
SHA-256: ba02bd6d5be2ecdd8c9bfbb3c584166d0f9f004d8f0b79c3523c5dd1ff29da51
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 14352 bytes
SHA-256: 539a49df7dfd4418bfde5f9e02b88baafff0e60e1ca1d66195a4b5b0e594a6d4
font_02_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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