Malicious PDF — malware analysis report

Static analysis result for SHA-256 a474027e6ebb978c…

MALICIOUS

PDF

97.9 KB Created: 2021-07-23 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d369c998ac3b517eff52ccf10aa9052 SHA-1: 2431a9f0dde7d2a90c4e0744900f655a99cdca73 SHA-256: a474027e6ebb978cf3b9f1aca324dd6d1e0bd26ddc2af3337e7b5bab0a0aa0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination and potentially engage in SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://casier-a-bouteilles.com/file/76400837070.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47281e2ca7---78054449931.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d2fb0dd23835f242d80b8bb1e60bda7a/76418093374.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/to5ejtmeeg8h888uv7n7d5euj7/42167885467.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/ganare.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/31418143454.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/45566953482.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091618e0b7bd---farowos.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60ECABE3EEEAE.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/55670595e5c06f557943fb0aa8255746/7570946450.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad44aab924b---37118832720.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/nurokugexar.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d961002cd4---13501194642.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842a4236309---sirodamudesabenob.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/6301741801.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2c7a21de11fbe9cf6fc29adc1ab98e3/lanuzekuwasa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00e7e94db1---99880048434.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d14170b3---degoliwajeted.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/56175705889.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/zuxurezugotevunivibuliwek.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gopijidaxamanupirugaxu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tnhilmfjubapsd8c8napst4i9t/pebokebiwanolobifuzop.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2411b4de98f61e2ba0a8122ee538e89c/95851877021.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573932f60a---62311270608.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2l7mnt7vf4d8fvmvjmmtmgg5me/pebekeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+turn+on+vitamix+a2300PDF 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_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 17524 bytes
SHA-256: d696d9a5d2f76ecfe308f1332582fe10527965ebea2c89e9965681589e040155
font_01_sfnt_off000146f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0B 10680 bytes
SHA-256: 564fce4cb8b1e48b673d63ffe97f7cf44260bc5230c64dc5300ab66a7b611ac7

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