Malicious PDF — malware analysis report

Static analysis result for SHA-256 e442bb048daf06d4…

MALICIOUS

PDF

90.5 KB Created: 2021-06-29 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c72edc6799c57e67ac3e22ea8a020df2 SHA-1: 4bd1b928ab8b75088a13858dc2cd7b550cf3bf08 SHA-256: e442bb048daf06d463c3f8a1ca65c5cc0040502efed4a6dab745bdc5eebda556
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm strategy, likely intended to obscure the ultimate malicious destination or to distribute phishing content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/166bd18499d77d53b64ec6a312999f9f/gaputo.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f64d1530d---28089649514.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/vopesex.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d524b3f7---febeteja.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f24f68a2db57928f6f22465f4a16f76a/58411683198.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/wolibif.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/lidog.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/porezuzezazi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d417a88840b---kagemilevibif.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/1387011541.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/21231193091.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sofujogarusoti.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/42fad0777a19d7d8835b682a75de3b46/11537690406.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087a54bd57a3---35997496608.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16ff31c7e---xizovixugasudividar.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qsumr5fpaqi6n9q5n3fgr3v629/33970897502.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3tikl17dl7ctf5683g2bdsumfd/danari.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba2dabc84---38227183665.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a669f1a602---dobifuvikeraramoji.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/pegeribusatulevog.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/80195584123.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/593f1d73c495c83fe8325a9d0664c2bd/92304820837.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16092e416ad878---kunidud.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/firolatepezatinubo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9229c99596581526d2893cc669b66d17/58093321291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+cut+pdf+file+pagePDF 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 1692 bytes
SHA-256: e9c4e0e686049a5010ad74189ac697e6a46b43bd0b0df71eb90b996c2ec7d57c
font_01_sfnt_off0000f398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 26324 bytes
SHA-256: ace4377b71b9cf2e8810a44d0d4d06a99c6e6ab949dd6b0f9d6974a7bc80f3d9
font_02_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 10600 bytes
SHA-256: d8b187728646be52017005ad2bdc00acd9e23b5385bbfbb22c0b379511884ce8
font_03_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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