Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1760c483dbb4a…

MALICIOUS

PDF

85.5 KB Created: 2021-08-15 22:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44c10907c1e1a5277060ca7926a1f7b5 SHA-1: 26267d8a0dc4e4d7805996718f29b103005f8e5a SHA-256: 3ff1760c483dbb4a7dbfdce3a98aea4300b413f8ba4cf635751d77fd9d6527f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The presence of numerous links on potentially compromised CMS uploads and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ewhamd.net/upFiles/ckeditor/files/55925445280.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1cacd3af3---79896973455.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836fcadc4c9---33741823550.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/pevavibegafaxe.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cdc25de90---99437629910.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/64085283269.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/fifaju.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/fizoworubagimurutazavu.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/20227999056.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/30779617418.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/70108244464.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/sejitexunulenaro.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4411096d---dapitupibuvadu.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/32026179778.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/wukamufowofilivetujex.pdfIn PDF document text
    • https://bdata.vn/upload/files/lotuza.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o0kbeg1k4df48pf8qiq5668eg2/72701154531.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe1b993cb---71870338564.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/rovexuj.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31105d96a---91634124949.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/pijulinekog.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a15a87a0f---defabanabizepufibader.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43164523862.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160967b3131591---lupawonowogivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+bypass+the+lid+switch+on+a+whirlpool+washerPDF 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_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10940 bytes
SHA-256: 08035b765109c084f1eadfc63df60daf28af4689af75f15e323399f1c4d7d048
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16752 bytes
SHA-256: 7b77507a53695e7ebda2720507ddcc4a5fc2faf04bd7903c9fdae94f40d8fad8
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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