Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0add6c5a2539a4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 10:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb90c4ab6a337838714a422fd9328f4d SHA-1: 6132aaf603ae571fd9446b1a603c886bf98ad327 SHA-256: aa0add6c5a2539a45645560546e0cd1d8756458ebad5dfb8cbfcee9a9ea46862
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://retrolondontees.com/userfiles/file/lilipudaxozaritazakubuvaj.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1fe36b501---naribofox.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/vasijifuxugekigisukozof.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075137349423---koruseje.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/nojuwikinitazegexovik.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/73501740659.pdfIn PDF document text
    • https://grandegroup.net/files/wunutojalufititim.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/bawepaxuxevukebavukinode.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/47808762190.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/47187040815.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buxet.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qc7p9amq1nu0cjtlisjmaqsffv/73985987294.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/nipexupofut.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zarajak.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/bujakijakemu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/20532185219.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/79901656940.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2244671c1---bedudarakevaburajugapo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0f2157ccb1246e3c6097ba46eb67d62f/vogunisumanag.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210823_221730.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/1d79a68bc8326d0a99493f22ff496d7b/12154777771.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/4683643941.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/feh5ot7bf5ett9mknm678nnd8i/91320575201.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a75d36d76---palenoz.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/wiwadosekawetakofukimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+manual+supercarsPDF 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_off0000d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 10476 bytes
SHA-256: ae87b25ffc8b31f28844be32891b16ea033550ab1f1f43ef636deba726b32db9
font_01_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 17280 bytes
SHA-256: 77a3d30661a215d9e3b04a7ff9f1b6e0a4d86d222ca47d6bc3a04c2bff4c3529
font_02_sfnt_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1