Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2f878b682958f9…

MALICIOUS

PDF

72.9 KB Created: 2021-07-01 22:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04054aa0c15b62cddb509bfbdf6c47bb SHA-1: 709314bc06245d6813bee7ec153acf30215fe62e SHA-256: 1c2f878b682958f967b70ec13ce0dc64eca667bc4838112eb38415cac6ee89b0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=diary+of+a+wimpy+kid+14+pdf+download
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/13a16dbbe32d9b7469efc4f95b3f0538/panemugejidasape.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4379b3939888f7cb363d511ec0d4bc91/judoxulomavaxekeboj.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/49792c8be3676b8d625be67ed794b05d/kogezurabe.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0159465eef24d70aeb858b69f74da273/30824250596.pdf
    • http://ufnk.fr/app/webroot/files/file/5651938741.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7c11dd6d---butowalajuwupona.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead4b9bf24---pegupor.pdf
    • https://x-software.cz/data/file/89195070420.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4000e539---lumirapuxamosilupikovedod.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a142f3aeaa---93071355917.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0krscc2ma6nm0718rb5kk1aedl/53208275728.pdf
    • http://greenplanetnepal.com/userfiles/file/96157249053.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ic39mr3u4640ndhaqb5tb9763p/30816748331.pdf
    • http://palyavalaszto.hu/teszt/upload/file/rasazulonapareri.pdf
    • https://luminex.pl/upload/file/42045719287.pdf
    • http://files.ibiza-ferien.de/file/49389992895.pdf
    • https://jokerprod.net/userfiles/file/28215932216.pdf
    • http://wjcopy.com/upload/files/pojubovawuvafurad.pdf
    • http://agrobud.net/uploaded/file/rusorogeronodivemujuxugen.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec3742b09---nilafidosutuvapelebo.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa23b04de9---tisapugovoguvinij.pdf
    • 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_off0000ba30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA30 16792 bytes
font_01_sfnt_off0000d242.bin
c3b50b9cb5ceeb3a4f9021eb4fd1c09c58a8f1413b497eaeebecfc1c50aa1dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 16604 bytes
font_02_sfnt_off0000fdc0.bin
f60922086439c6440c69785727dee8ba08c086a988409e975bf9e07b3e0ae095
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10684 bytes