Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b24ad34c0bf684…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 08:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 138f48cf7d0eb679b11514d2ed997697 SHA-1: 0a8be47e2ddfd8054fadc9578162ee70ca14e279 SHA-256: 56b24ad34c0bf6843487afce36b2ba26441d1ce32c2ed15a672119bc852382e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various compromised websites and potentially malicious URLs. The presence of a callback lure suggests a phishing or tech-support scam pretext, aiming to trick users into interacting further. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=abu+dhabi+police+logo+pdf PDF link annotation
    • http://pileshoppen.dk/userfiles/file/31514936179.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k5jpl79smnftjj0rbrif49s027/55080599216.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1ee8bc74a6906eef7f449011083eda2d/guvazexupike.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6efbf548ad1f408b728270bd32dd749/30582876081.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/44714729623.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db6b83afdd---89675851043.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1jnv7cvkn2451ktnlj5ek4mug1/254076126.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/6031615725.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/rezomida.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b009b60eb59---92206134129.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/aunaq9bsu1o4fntvrthbhve0hg/vibazulukitif.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/54921622222.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/57dj78p7s43fnse0340cdp4djo/migidusunobagide.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/bizenefuzukaketow.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/5486520144.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/risabisunomete.pdfIn PDF document text
    • http://bakoca.hu/files/file/96724124098.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a713a038d98---dametaxezowitonido.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed88fe4d8f9---22186243368.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tubusebovozezijedoxel.pdfIn PDF document text
    • http://willbramephotography.com/93826975311.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/81109339389.pdfIn PDF document text
    • 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_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 17544 bytes
SHA-256: d548c4e2f528d9eec51e20c9e8775af776f2efea2715c9c8a20d887bf996780f
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 10652 bytes
SHA-256: 5f466e908a98bd3b4814641ba0318947dba7b425bcb3aee4a5c03a316f0941bd

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