Malicious PDF — malware analysis report

Static analysis result for SHA-256 255c3373e3199659…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 01:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1572b035c135c61f7fc9429c24640d74 SHA-1: 7321b1a2791a9ad6f3f6f8d26350b369841d6c37 SHA-256: 255c3373e3199659cd03a5a698b1ea1ca7df7a5aa825c71e417c31e85abea2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philipsphotographystudio.com/51620338132.pdf In PDF document text
    • http://autodilygood.cz/files/file/91569596708.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/lewukotuziwejisuvesot.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/68425500916.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/13945754831.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/farijotenokiv.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sixiviziruf.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/96237520099.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/weloxavezen.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133259032dc1---jipowoxibajikixenelo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614073fb40a39---malipemi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/riduz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38b4d9fd7---widetof.pdfIn PDF document text
    • https://scalping.ir/data/files/file/30773778317.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/45591241627.pdfIn PDF document text
    • http://isvpro.com/custom/files/3628246467.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/eb2f8da7abedfe74656f8dcbb9217a8b/47908065422.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e287565313e19d40d9abc7aa04c35f7b/38673479608.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d1b9522cc2fb3ba858ef8bf36d02797d/gowofevimu.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/varulaw.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/77170730627.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fepuvafed.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/22615459893.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/89240189945.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/210906201754501587umyml7y4vcfn.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/22130103091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+robux+no+verification+generatorPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 18812 bytes
SHA-256: 90e54f2dff60b86015d52e25c5e1daa549a420bf57ad1306e9797931ce5cd9c2
font_01_sfnt_off0001073f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 10680 bytes
SHA-256: f78924d49c0cc7f139db03864dd9a1f6f75fb847866d8e7c0ad0f8ff9f2c6c37
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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