Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a053560e442820c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 05:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64da1975d7b24a09b4656f5d893adc5d SHA-1: d45f26f39d3ad07feae9c67560f313435fbd70c0 SHA-256: 2a053560e442820c33bf7b0352d4c7cf1a36bd4c17f64781f9ef41262db0e2bd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, specifically a callback scam. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and uses disposable hosting, suggesting malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc33b879---29842079094.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/32030279934.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/51969598856.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/13864828504.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68233123928.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/60272934916.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/45004730307.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rojugu.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/16847155754.pdfIn PDF document text
    • http://cx-gl.hu/images/files/63201731505.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/5892159402.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/71f3b5b3eabe9ff237e6e90c1dad5f49/10177871074.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/40443459616.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442cdf0401c---35036231589.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/53364459892.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/97882877492.pdfIn PDF document text
    • https://invision.buzyhub.com/files/2945426326.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/86762052086.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wesivezepo.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/disibaluwukogamozuli.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/vupenuxopilefujol.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/voximeko.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/29410082327.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/gevoreju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aoc+a2472pw4t+24+inch+ips+android+touchscreen+all+in+onePDF 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 11024 bytes
SHA-256: 82bb4b21d9f5c4d32dff9fd2a6e434a1784c7a4ba596c17a79654bd4153f5ce6
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 18512 bytes
SHA-256: 782a305fc556158a13823aeb1a51b95c78cb021fe21325a4ffed35878721ac6b
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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