Malicious PDF — malware analysis report

Static analysis result for SHA-256 596065a118026186…

MALICIOUS

PDF

112.0 KB Created: 2021-07-08 08:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d4626dfa953386d13c9860792ee5de7 SHA-1: 5a73253541fdca8d38d693b88dd30fbb75eedae3 SHA-256: 596065a1180261868a9d3950fc18cc890c7c4dc7dc7554191bad6c87afdb2442
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external URIs and the specific heuristic firings strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/153b0351d6f08c4fdd5eefd9b7b19614/suvizorumibuvafedaw.pdf In PDF document text
    • https://europartner2.pl/uploads/tofobiwewizipo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/44608081318.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607727c2d15d2---37348603501.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kutokagabajijakoxated.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085b28f72b85---jidibuvoxoxosutuv.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4vvjtei203nhao5o7lo8e0str2/67404816440.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1c328781619576a5f16287fb52bb295d/72122785776.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911096b3f98---mukonozi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/958267c2af2b90f1ec136727e6963364/56182761378.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/pozogidu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a06dfa55f66---20258008111.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f4dc0b52---65535624786.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/54517770498.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/24834930024.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095bba1388b4---zogabusizagobasubuni.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607115a8d149b---zubiza.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/totilovazuteb.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ec785ab---lujasowamujumagajiz.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/wufuro.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae94764e7---52533890555.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/58b8429e349bf83fecbef0505a102d93/sevibesetari.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086714a3b5e5---23954808940.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lokanobumadupozipavok.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4384c5b2c779a1f9ded020115e4e594/kogipixeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+bacteria+a+unicellular+organismPDF 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_off00015726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F38 16444 bytes
SHA-256: 324f65c7becd39f7af7fc0aa5911edae65723f9324451bfa7f6a817da524b12c
font_02_sfnt_off000199bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199BC 10764 bytes
SHA-256: 94c8e60d5b5847e7c9fa804853876085805111a619987bdb22d37b12a84c8741