Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98c344df0a6e455…

MALICIOUS

PDF

93.7 KB Created: 2021-07-19 21:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cd1efe5a0b4e3fb163ea53a915b1b2d SHA-1: cf2b14f7466586ce047e070f2da6cdb92c0a08f9 SHA-256: d98c344df0a6e455c3b572ef83695e717527ea6520933f30fc3130f0d2ce458e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or phishing campaign designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/35a8c2c47290ad3dab7259182c68b32d/lorawezugup.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/dce1c5615dd8daf22b5a21e938165d1b/tuwurajeguxazitakenixuk.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a1c48afb868164b7a9fb705a1ad1bb9a/visabewizatasi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f9d761d10516de12f75990acb9aba2c5/zemijefowurutunaridupiz.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2cd3418c6c2d59baee85c51575f1402f/todezutuj.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/ponujuto.pdfIn PDF document text
    • http://dzbnf.com/upload/file///68135432187.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/52686061589.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/4eue5rfcd8l46ov9ce3kb5qtu5/64990637201.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/leriwitinedivadok.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1a39f00e---68616704715.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/65687219493.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fec44c512a11a72d971e1550b2340816/mekogiserufivavinukefoz.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f001f506---14302465801.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/lijoc7o831mspv78geupmqfk12/lujevikalakop.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/pakubexisukavesizetalu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a42f58f55---47943298357.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/94970256254.pdfIn PDF document text
    • https://netpage.info/userfiles/file/sononosos.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/detusetekovofet.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/26749679796.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/befokupujosaduxetu.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/zapabuwibirireb.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/29476754934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tiny+white+bump+on+waterline+of+eyePDF 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_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10856 bytes
SHA-256: 9f79f14863bd53bbaa833d3d1b35234ea800f3bbf055eb570e7ac3a165aea97e
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 17484 bytes
SHA-256: 7d2f634e2a71101fb541d9fed0f27ef8af68457abcc132e9f634c7376f061339