Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d79afa06be705c…

MALICIOUS

PDF

96.9 KB Created: 2021-08-03 04:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efe7f11168f440a8c452dc1b416bd822 SHA-1: e963bfa6a4102e9558f19bbf867f4e70e845ffcc SHA-256: 87d79afa06be705c8eca031ee8b13d2812b2203f3c4bd1b3713c65ec33810e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgtoqjcq45qgfngmgrd7gd7493/gemexexa.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/eg27m95a488elqqiue8417phts/12385740203.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/bopuzotapuki.pdfIn PDF document text
    • http://vejwun.cz/images/dopudetudef.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210721_27DAC1D6A4E4267A.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f6305430d1ed0bbf047aff3ee3acf32b/58982937179.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/dc07d66cba9deec5ab917bc84a2d1ded/gazadobosofopatezulo.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jubede.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/bukatelarimumebuzuvotu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607480d24f4aa---rufegamegonijujerufe.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b781f64eeae---50363635778.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/tapevegeki.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/68139727588.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/vakesedijeda.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/sirotetovazeralij.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b69d57c78---13586334119.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//misimuxuxowad.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a96925ee8d6---nokigojukewani.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xukinefubefogomine.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e2543e3a3---77309489668.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/97c790a5bf0a6e7912190f05b1975269/39551289839.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sutasan.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/72515058114.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wuvafokusesajalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+secure+folder+on+samsung+s20PDF 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_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 11256 bytes
SHA-256: c468d1714ae129b87e7c403342ccb65520986b4a1c42b6a4c72daf1b0c741992
font_02_sfnt_off00014736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14736 17604 bytes
SHA-256: 955b2189a2904dd1ea763c598e01a273e45a5b19780075aca1a7d233730b92ac