Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96994f67be38547…

MALICIOUS

PDF

83.9 KB Created: 2021-07-19 23:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a6219fe6bc8aa4118e7d0071601ec1a SHA-1: 93dc9efe646bdd1b73845a26b70e9ace21ccf8c0 SHA-256: c96994f67be38547977ea96b791576eb42bd1344251fbab73d8b1442daa0e9aa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7aa7e2b8b35bb9063c1eadfbce322046/74241356385.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783f1eaa8fa---xakekoguvigusamazipez.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609188dea636d---fixejevojavagebuniwa.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210712222155.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/4295045347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c5c70083---15000812806.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/77539543249.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3d9a37bd09ff801af6c804803b848d61/76941356250.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/bakutudujed.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/732d35be4c1a83dbba7c94b871e718b3/19171086818.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/nmie15l2ruunop8mmqn05scsf2/kawukexuwojog.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/norur.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ef9d21f7---94928972077.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3037d9094ed6c5453b1c925001bd3379/68732564096.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/wuwux.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/i9cm2usua4cp0k7spbrbvc05iv/jiledaletib.pdfIn PDF document text
    • http://canadanur.com/resimler/files/33325056782.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s232m02tntksptfhqqkjr9n36k/jafix.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/45560058820.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/62294682638.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa31ae3f2---somokuzuwejoxivofujesoj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0205bbe8---lozadiwizoxatuzolakemusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=is+snape+harry+potter%27s+fatherPDF 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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 17444 bytes
SHA-256: 07892997dcb1c4ddbbb3430711faf31b3f2cdc7ae9c637e7ee3108ec6baf335c
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 10416 bytes
SHA-256: 11dce3fd12cbb3692df824020b2fce6a76d377f243d7fc7668dba1c82578d5ae
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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