Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c59c4db524b17ec…

MALICIOUS

PDF

76.7 KB Created: 2021-07-24 07:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30c6aa05f75e9f1ba953863c8d56fca2 SHA-1: ca239d54ffb16a8a5798db8f71d32ab226667aa8 SHA-256: 0c59c4db524b17ec31df0cee72a7fa2e3c8bd0e5de131e5eacac1b328f5b149a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings and URL analysis are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/91d399765c9f20f17cf4cd8a36326dd7/83805944515.pdf In PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/83994119827.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16e634479---folavune.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/579f46fa3c858b218250f464b67c5753/xetakebibajifafevogomox.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/23870588638.pdfIn PDF document text
    • https://x-software.cz/data/file/75670379112.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b245580ea---49748376401.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///6306429555.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/9386251693.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a6cbaf3a---89485007988.pdfIn PDF document text
    • http://amdind.com/userfiles/file/84324008068.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/murob.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bbgasoe30li1srhatf4j9s7c61/84856750714.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0178a0645---vajodidunafanosovukupe.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kgjc8je0r20o7fn4bdmmr52mt5/52362063827.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/12430724820.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/67811670929.pdfIn PDF document text
    • http://africareview.in/userfiles/file/64339950229.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b53646a8c09f2d844ea3b207773c1816/ximivubemilumopotu.pdfIn PDF document text
    • http://becucci.it/userfiles/files/46988247586.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/42568089280.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_4217B187813FA60E.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fizasiw.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/10088112693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=programme+construction+figure+g%C3%A9om%C3%A9trique+cm2PDF 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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 16524 bytes
SHA-256: e940ce5862b403a2e457821c1fbd73c2864faa62ce6f0b6de197b2598005d82d
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 11152 bytes
SHA-256: fe39f787b01bfccc2a44d8d4bbe7e26d2d4f10073cd5725e85e7caa899067fe6

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