Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cd12ce9a0be305…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2c33968783cc81394cbe1ab1e3b67af SHA-1: d78ffdeee8f9463d291c5f2865653e891ddaa2e7 SHA-256: 37cd12ce9a0be305a1a5d9eb93746fedbfbed43a23cf1b2635cda6e3db59ca2e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to a malicious payload or credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/aa84cce1144bbca1c17eb840d654ee7a/74099562596.pdf In PDF document text
    • https://safrano.pl/userfiles/file/gatozegutevibino.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ef530b04580f5516f5a2ff89e7925ad8/latuzofobasuloxupaziruxu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/93453876734.pdfIn PDF document text
    • http://edgecs.net/documents/85075795727.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/07b5fd7af87fe1cda74fc8a309a90c4a/32135861989.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c50d88c76ce1c8d0c01361baba917ed7/koguwuvadidogegifemekike.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/jarir.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf75116b7---newodadikulabunefobo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe5a3edc1---gutofimuririrarubolali.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/79219c1130035dc583b8c24ee301773e/venutuwexosanarow.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085644fad263---bogolas.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/vefuwigevelelodon.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/13234447583.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/7036065493.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b607547b6f1---jevus.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746ebc2fa75---11848946364.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/49162276084.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb3d85408---nizenedaw.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/43958852145.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i29uhu4lu9hok1mdeocr7t0o9o/xonaxebuxijapuxawofuji.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160926b93c05fd---44878455366.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/duvegemov.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/291f44bc717ef141df4fa5a767b37e5a.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cc4f4cfe1942f6ca3a9d226582e796fd/15985539549.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760923be08---94226816420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=semiconductor+physics+lecture+notes+pdf+class+12PDF 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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16776 bytes
SHA-256: 1fd05b7423afbed116472f2057e182dd944d84636b7ade41b3c0b4b23e248e79
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 11348 bytes
SHA-256: e0bb31520b0b6e12ff4c5a005f654a3513f36a599b84a98c1ff783bbd21178d1
font_02_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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