Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4944587dac8000…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 15:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 492923535b411068c3d771f149479f5d SHA-1: 71ce23ecc34fb80aa51b3cbfc4d41c2e3f95af87 SHA-256: cb4944587dac80005f1972f8fc4ffb44899bfaa1357c09d99308d0f4b6da12dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress upload directories or disposable hosting. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://atraba-holding.com/userfiles/file/lefemijifagilusapev.pdf In PDF document text
    • http://gibisch.org/files/files/48065055991.pdfIn PDF document text
    • https://loctra.net/userfiles/file/7046634437.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/38741609655.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rl5hqkilsm8sgc61hrb0m6a9ge/55830966885.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/72282412034.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d59380790c1ccaef803680450ab0435f/25269461815.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9be63482f94f4ba3d382cc537f54e861/nilila.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5136d71b698a5dea698f3356ef6a531/jinegarekususakaluve.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6806f7d2---buguxomosezexixewe.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/legonagoxuf.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/449ed15ba2aaa65648ff63dacefd14d6/merowujokarafiwaba.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6qd2prrks5dkfgm18s2o2g31a2/99982162670.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/53515530899.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5a10c1e6ea56742249992d82c617dab9/7347362829.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/lafarefusatomikilaf.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/vknvg51d28rjj0v142spa2odqf/muvidixaxasifeni.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/13658262931.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a241b7a49---jikimesikubisovomewojaket.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/42782679701.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a834abf62---fidafetadojoredotesafez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=give+an+example+of+disaccharidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10992 bytes
SHA-256: 47fd68969f29aa9aca47afa211a23b776ef5a6de5d71885e45b124e7b03d0d2e
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16968 bytes
SHA-256: ff34af9d173e13148c34f437f42c080406ef46ca3ad414781160c927a7cae192
font_03_sfnt_off000142ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CE 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b

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