Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c47551552c4ede…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 00:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a53eb7f38c8fe346c1377c52659969b SHA-1: 32b4f3d1b40465f76ce0b5ee141e835e08dcdfa9 SHA-256: 23c47551552c4ede8ae06171abe23d891a8027dc78a362890cd52023d9fc25fc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f312f669---zokasizuvakesi.pdf In PDF document text
    • http://v-lukomorie.com/uploader/files/18437799181.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2273e4733aa91d32b5cae521a7a742d8/garevexa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1226647244.pdfIn PDF document text
    • http://ciskmv.com/css/file/joxajirusebuvok.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/kugesizatunobogixugajinav.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/34131230208.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/gonujamimipujizaririxavi.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/borameg.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/vuxoledimupubedejum.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/baritiwupeta.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9816abb8bbe6d3ba8be89c76580d5bf3/gerupinujabiwifaxararid.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108230309274612.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d510d854c06---dalebilizemiromi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6460677d---98354722425.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ca1e929---35369026827.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609498c6c3193---sibatumolologodokisup.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/11187928437.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a7b2aea7---98045998038.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/tepezipilenider.pdfIn PDF document text
    • http://geasit.it/userfiles/files/supox.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/265fe93226a9da1d89b066f2308dca93/zewiwinolub.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab1cf1089---golafosigokana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=calculus+1+worksheet+%234PDF 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16780 bytes
SHA-256: 1e4603516d127f06b236aa76ea76dec21801354655e5b16bd443c0b71d2a3339
font_01_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 10492 bytes
SHA-256: 241d517b3cc7023b64d9fa88fb091f551ec3468ca0cb96698d008af6b9b47fde
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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