Malicious PDF — malware analysis report

Static analysis result for SHA-256 974acd17e8ff096f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 07:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b859e06f472caec218e093b28a464e9c SHA-1: 0055b486974ad6666a96409e81e47fae12e3ec09 SHA-256: 974acd17e8ff096fddbaa4cf95ae269e8e2ae48d1f6031c08dcbd2b51d08388b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=apk+store+for+android PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161387c2be5d90---36834106633.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/motubonulotaremiwawofoso.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/roxaletemepumerijomajesem.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/vuguwe.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ae336af019be58ebaeae4de6d0034a95/13114923488.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/66120481641.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/9021030143.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-07/images/files/jorazakisapas.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95f012db8accfec25d418c3c110848de/bodudiwafisiwofimufevuset.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926364c4be---dudojej.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/ravefenuxiz.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/29675763955.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137bbaf3ef5d---mowuwuwazelo.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/xetonomegeto.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137cad621fc1---ladutarejaborafegemupomav.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/3638031092.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/4227326671.pdfIn PDF document text
    • http://cabini.it/userfiles/files/7680241358.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/penuxuxavegusawuwu.pdfIn PDF document text
    • http://benetalent.com/upload/files/lixogowe.pdfIn PDF document text
    • http://teresachild.com/upload/files/kajivufitorofazabigoj.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_53DF46AD5BD6C487.pdfIn PDF document text
    • https://masukpt1.com/contents/files/vusofax.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/pepadefumovuworinegutenor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d586e2e803---95622345241.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 10516 bytes
SHA-256: a6282eb9a5da470150d3023ad3070f54bb543e1ee26d42d4e7c21114f9adc156
font_02_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 18920 bytes
SHA-256: d67312124a3c81a3a12ebbef9a87d6d58008df7aa1817c725a6f73ca2ec63781
font_04_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16192 bytes
SHA-256: 126aabc53b187bc4421529373f04e2f66a11804dfeaeb35cb650b132d56c1dbd

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