Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4e1a2a08991209…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 01:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12a32bf3384dd7133c947f32f06dcc31 SHA-1: c0d08533024765231e6642a481fd2ae289177ebc SHA-256: ae4e1a2a089912093c41ba217ed64e50556d1563b32df0f042b1d7d808252ab1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://philabc.ru/uplcv?utm_term=the+lost+hero+ar+test+answers PDF link annotation
    • http://mwflower.com/upimagesfile///nadebolipajibubit.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/doziwovoniwi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbbcc0d0cc6---sasamugopesekanijijo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b88os2l70vl9v8h74c94vi8967/23586027931.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773686b8847---bafisigelojaja.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160de5bb826cf3---95286168635.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/73836258459.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/vinawomoderaweboduro.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/13525890476.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7b3d4808---59506959495.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4h19bduhjkgdk5pbpsteoe5762/nafuvuno.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xipuj.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087901cc4802---xifegufedire.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e0987efec0d4684f043ac9c7b6a3e9c1/pazuj.pdfIn PDF document text
    • https://irantruck.ir/data/file/banadirularemasonegaxi.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/80551614272.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210803185423.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/bojegonirisin.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5gqv8aeak1g9kka7tehci67aq6/75213132787.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/77624323509.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c42bbe9b---tasewopogobolef.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/557e410532be0f48b1f0fd1362709b39/fumuvuj.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_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 10160 bytes
SHA-256: ce1f080faab34ed557e18dd307950916d24adaa82a91a3dd9e2b0bd7d22b9dcc
font_01_sfnt_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 18856 bytes
SHA-256: b4cb436a38d5fbd9e23ae0fe349d4da171891c940425f17eee1c445a23ece454

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