Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e7705b5362408f…

MALICIOUS

PDF

116.0 KB Created: 2021-09-06 16:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9df2cd5fb554ad815d8b4dc206628216 SHA-1: 8277ef16320880c73797af4aad9448ef3cd975f0 SHA-256: 02e7705b5362408fba1bcb1117dbc4632c3a7212e11771412cdeca0e8fa3593d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://akinmedikal.com/uploads/file/67742385595.pdf In PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/3855b8e714d2b99edf001d2c33608ec7/58692797721.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/27174q0fhrfi786bqsag135it7/rovewazebogonalavewopuj.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/45020069016.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088216ad13d6---93946410303.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd85e729e0---92137180793.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/34436430355.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/nonifisozavutomo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/18904235219.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/1581605905.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/bivavikorasitudojezegu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45c15d65ae---75065869076.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///lijikurupovinixo.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/38614370463.pdfIn PDF document text
    • http://landpas.pl/upload/file/nukuxarulek.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/51450c6dc0cb3f656cabffd3989d389c/46693967097.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1629974742_c917473f2e.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/84831653100.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/97661409732.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cdd3f8f8---37349017472.pdfIn PDF document text
    • https://purefeeling8.com/data/file/xorijilefudufililumu.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/61956668966.pdfIn PDF document text
    • http://hodori247.com/uploads/files/bupukukevobasimaxuk.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qi1cjv7n7bdnnj78ps092knn86/gafobutanopobikuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=%D9%82%D8%A7%D9%86%D9%88%D9%86+%D8%A7%D9%86%D8%AA%D8%AE%D8%A7%D8%A8%D8%A7%D8%AA+%D8%A7%D9%81%D8%BA%D8%A7%D9%86%D8%B3%D8%AA%D8%A7%D9%86+1397+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000187d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x187D2 31652 bytes
SHA-256: 98486c2baa96dd9babd77f5a1fefc54f483078d0754ccab9215b5f42500254e0
font_00_sfnt_off000133bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BF 9812 bytes
SHA-256: f5500b88af66e5af15b254d8e2d724d1b4bf2dc6d02729dfbba2582ac9f14286
font_01_sfnt_off0001495e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495E 18356 bytes
SHA-256: c66204915bf35a4eac7784ce608f27131b78d9eafdb78486dd6ebfba64ccb984
font_02_sfnt_off00016672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16672 13628 bytes
SHA-256: 55b2dc1fd0cd7533cc164c62eb9215c48af98fa39a62b0f103721d20865c1b1f

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