Malicious PDF — malware analysis report

Static analysis result for SHA-256 4894697639d1819b…

MALICIOUS

PDF

76.3 KB Created: 2021-07-04 18:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d937da58a94dda37c66f82f3ca7c85c9 SHA-1: 86b3a794e2f5929bc1dd40a686ec33f9b3a3f102 SHA-256: 4894697639d1819ba1ab5a163d02b509e9145b9a0a701384645dd62d1cd31b50
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 pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://tachikawa-derma.biz/ckfinder/userfiles/files/valimedegavose.pdf In PDF document text
    • http://dekogard.net/deko/veri/_files/wesemiwapitefuk.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/01cbofn8ihcpu9pr6745u9uhqu/70061399545.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/g0dokbsforp4gmbrgd8l5tpfr7/9562660089.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/viferejokoxifodu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80e7504e0---34575143984.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/49tnscmtndibrromq7vv1rrkih/setususepuvezijif.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc53a1c9e---pasiguminofeti.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/zonugoxadikomakesajitejen.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/pmqhqp4g3eoc1gobl7laarcl18/70195515919.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/58096647891.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/90cfef17bcd1b8ff891dfd8e7ae25561/biwipa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce6370aad---94694113294.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tegixilizaje.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mokuvubijomemakazekiri.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae99c2756---69876627625.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8d0a3cf15---67535867476.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609492a257341---bigoz.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/36v7li0valumad9c2i7g1ua2vo/gojuwafabunilupukegaw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971975f04b3---xesapenimaf.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b88513b3ae7f32cc8267728c1e979b12/30776904568.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1883a8ed575b2417c22fd301f455c0e5/rukatozumufonagedatox.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd10951da2---pefularojutuxulotoxiximis.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/50607731364.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/37140660781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=find+area+of+l+shapePDF 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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 10472 bytes
SHA-256: 6a4313cf828ee0f37c097010b6bb7b1936bb7e310ce059820a6bfeebc7e99fde
font_01_sfnt_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 16888 bytes
SHA-256: 6f627005be66caf58e22ad109ef1140745a9729400d6080382fa02637701aba5