Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08d40e19b1c8ed2…

MALICIOUS

PDF

81.0 KB Created: 2021-07-22 02:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: df6f2b18ce0eee5c96aff1c8151cfb6c SHA-1: dfa14b872cb61101b956e24759ee9f96421edf6e SHA-256: a08d40e19b1c8ed24387692fa361d4b8f399617237e0a8d2fcfafaec374fd2b1
176 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, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to compromised WordPress sites or raw IP addresses, indicating a likely phishing or malware distribution scheme. The presence of these links suggests an attempt to direct users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://najlepsze-w-polsce.pl/uploads/745150817.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/becc48ae882dae1745e12fbca06624e1/65492931409.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160827868aad36---18782870723.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/14791009936.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xadipuwosuxodad.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/32422962075.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87f831b61---67997302386.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc6013866c37b015751bec78e243e3d6/68702482988.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e5677b1a---20031873867.pdfPDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe8527cc1a---damori.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/vekite.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9e13450915dae3a3f1138efda0f7545a/tuwopum.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/fikideras.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4979d0d716af2a36d7a171cc36358f3/badurizudevovazinobevek.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o9360acdp4eimlpmthkpuol81l/dozuxexapopuxasegobe.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/a69ca40a9731dd9b817a881ff93e2154/putudaxiduvavulabes.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8k4q8e781tbrp2bh7em4e0dp62/vujesuwabe.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/bimujoboj.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/sozimurusokixat.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d613871c4a0---wuxikutemopawinaxer.pdfIn PDF document text
    • http://ridendo.cz/files/file/16959931678.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/43605254334.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953beafecc---midegikifesawugadurunuv.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gudufozoxedonif.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/76848050104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sonoma+county+real+estate+taxesPDF 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_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 10692 bytes
SHA-256: 4a7178966c9b205b2199cf501b831974541e94119c7beb8c87a1e3a575135bb9
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 17632 bytes
SHA-256: b9f1a07c659ea37198ca437cd93b88f36975864682e1f63c6bc500b68f19b194
font_02_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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