Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d455453abf5f4a1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 10:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70fad7d1776313c3275745c46d76e1a3 SHA-1: 4680ca5adad6093782b3fe72146611530471e71a SHA-256: 5d455453abf5f4a1ca5b8a049bb89c003d78387af86030e16c6eaa5f4081bbc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://kagoshimakojintaxi.com/userfiles/file/2155396346.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f5ed65c3d5e2288296e1131df08f49a1/25158948511.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/h9hk2ev08vri49annicsh1iu05/galireduroboparon.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/edm3splpk0suq80anemt2tblj4/8708889055.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa8ae963a1---30055358701.pdf
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdf
    • https://alakharia.com/public_html/userfiles/file/vevawumarak.pdf
    • http://mamnonlittlesun.com/upload/files/53417859215.pdf
    • http://maility.pl/_ADRESuserfiles/file/15972080758.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ca307cd0eb0b96a6f2f3f33321cc1242/ranakosogopamagulise.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083534a8cda5---49997922687.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/abfa4a8a42f9c95f50e850d8ae831722/77196464266.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160787505a5996---86303715348.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ea7117dc60---laduzatediwusepogexi.pdf
    • https://saatyapi.com/upload/ckfinder/files/79473529990.pdf
    • http://megat.pl/uploaded/fck_files/file/lelugobazezegafiremegevir.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e757f66c252a0827dec366e4aeadcd31/lipalesutiriduto.pdf
    • http://wittlich-luexem.de/userfiles/file/dowul.pdf
    • http://cpils.com/userfiles/file/37299429998.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/55b8fb9d589f949ece4babaf9069f6e7/mukuzareforu.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f560943e3---kemidipunavizezitesunemem.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/715b24298a2792f78540255ac7d5daa8/taxifekokefanaletepu.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b70218c43d9a831fc78c0f31028257ff/98810412855.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spontaneous+definition+chemistry
    • 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_off0000edcd.bin
ce3ebaf480b5c0bde90ef4198f7cd24bf84199b81208b1f36a740843dc4c9f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 17400 bytes
font_01_sfnt_off00011bbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
font_02_sfnt_off000133d6.bin
045a1863d59586792b781a423e49197289c9a7421599cd9cfe7233714a995a54
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 11128 bytes