Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab96c2b37f62b991…

MALICIOUS

PDF

86.7 KB Created: 2021-09-01 04:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc79c66645ed017aeaaeef3e1cf29d12 SHA-1: 3a136e1bd4aff15b3ffa98b0188b0cbc9b0a5986 SHA-256: ab96c2b37f62b99160c97c8c8ef77e113ebbdeb524baaa5200e5fe82733a77b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, containing numerous URLs pointing to other PDF documents hosted on various domains, some of which are flagged as compromised CMS uploads or disposable hosting. This suggests a phishing or malware distribution scheme where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://worldtile.net/jangheung/userfiles/file/vavilebazoxidutizup.pdf In PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zaroduja.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/90208854719.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/latutezu.pdfIn PDF document text
    • https://saam.vn/images/content/file/nituwamuzikemabofaro.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/213ee785685a2293f97ba0fd4a3931c8/60600671252.pdfIn PDF document text
    • https://zold-kommando.hu/files/rigitejizajodakod.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/51060344573.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/60040823237.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/pezanifimamulanilo.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/gafelitorodisofavabof.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d4382959---44509396368.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf6186ad559ddee8bf69858ef684f7c0/lanija.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xuvivewujikarebebo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfab7cd8af---88577256231.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/58506123358.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/dedelabubegu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608932348f1d6---38030145909.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/26274228743.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/masinurunazoribusupa.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2e7ad08543e5d1467113ffcd48c5130c/kalezazipevudezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=space+exploration+problems+and+solutions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 11200 bytes
SHA-256: 97c2311c1be9d54a8ae7c8935446810d6bb23f8c8aa883fbc301df3a4fc34e5a
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 18792 bytes
SHA-256: a9d36d4a4ca5c069cfeab31ae94351222e2daa68f28ed7c40cf290690ef9493b

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