Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acf36657393746c…

MALICIOUS

PDF

86.6 KB Created: 2021-08-16 12:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b15ad6e38ce3b3b34cb2f29b6ae24ca SHA-1: 80386843b955b76dd7787578b08b8c3b38ac3f96 SHA-256: 5acf36657393746c3ffa1ee847f6aa49017b0142512bc2c3a08ef2366a423038
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm directing to numerous external PDF files, many hosted on compromised CMS uploads or disposable domains. This suggests the document's primary purpose is to act as a lure, potentially for phishing or distributing further malware, rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://24emk.ru/ckfinder/userfiles/files/rovoxiralafaralukugonu.pdf In PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/87555hnlf8bo9fi7cl6obg40lt/85045561155.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/77033115005.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbff6fabe8b---92659124716.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/xokemezo.pdfIn PDF document text
    • https://componentcnc.hu/uploads/ckfinder/userfiles/files/26101125554.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f17fa91a9f7---nemowunedo.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/11977452609.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217141151138611.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f2e7ae9a---komidedo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/p1eifraen97n7gldf0udbp5tub/jonuvokalivejomesurozi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/38r8ih5laojd20dqovnq86hm22/34551122388.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/lanef.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/magarolavota.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b29d88828e6eab094b8f4ad840c0be41/86931564241.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/pixunamalerata.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/kuwugabubonusimusunomu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0728c3f0c9---88020469201.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gikujodelipakak.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51becd846---59420100420.pdfIn PDF document text
    • https://chptravel.ir/data/file/28730895069.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628715101.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d62aa8f77---jamezurazixosewo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zofajadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cheddar+cheese+making+process+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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 11048 bytes
SHA-256: fbb1493504cdc60a067c78df00cb32d371eb60404c264700f46d114c4038dd0e
font_01_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16820 bytes
SHA-256: 370e603f1da37d9bcea218da90ea428089cb76954fbb1088875294c6c318757f

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