Malicious PDF — malware analysis report

Static analysis result for SHA-256 f072b9f4f207109b…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 12:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dc11e4282198d4279dda895f24bf7c8 SHA-1: a2943c43a60692b10c09dd8397cf07b7d9bd7915 SHA-256: f072b9f4f207109b052fabb9aafdd25508bef620f263b7b00c75a6ac8fafee3e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://taevlingar.se/images/pages/file/35016547048.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9b6dab45---85797291745.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0afaab947979aa81a2abdd578ca9df9f/xanulesavexokodavija.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9dc6ab96a549faab0139a43677ba8f90/rekenekerepodibobizomani.pdf
    • https://svetplus.com/userfiles/files/fitokinajogolaruzuriz.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95754149593.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/vp7ps0vagk69q2fi3dl7d8q8ps/95463738075.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eb3748cd7---86953822666.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9164be5f---litowubopapedidejakano.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866cb819112---bosuwujepukudapovaputo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/88226f423f64f85ae90344398dca63e2/65538702913.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607de89ae0be3---3163487312.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a75716a2---xeduvobodizazezikeb.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726a9868167---budutujadeve.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/937edd17497b33773e2a18b695966bf9/xipoti.pdf
    • http://onishi-kyosendo.jp/archive/zidafad.pdf
    • https://telenovella-bg.com/files/18966172112.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2592d5f268dabfa4ba1184f6dc1a3f7f/82259966037.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/gilolafodevuxupaluru.pdf
    • http://sns.hu/_user/file/92284515282.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082374c2640d---xewowe.pdf
    • http://brilsports.ro/userfiles/file///9085621724.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9e2112103432a0a99077bc087cad3f11/denipenodesifamebujetidak.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/d241qp5sif1re8frrdjb7m7l42/92195626689.pdf
    • http://canigrup.com/userfiles/file/44539660411.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=black+snake+with+orange+and+yellow+stripes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2a.bin
06b45d33482cfb0398f4be9f6476cddfad0c6da3676c1761bde75a5cf96695ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 17232 bytes
font_01_sfnt_off00011863.bin
ea14a41da516f872976914ef6e6e2c716143ab2c62515f3c11ac77c2b6cde027
pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 11140 bytes
font_02_sfnt_off00013246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes