Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33af1d7e13debcf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 21:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04e6849d0a64fad3ef106f6b25a5b17b SHA-1: 509a18797115dafd8437388d6e27bed32b1d9b9a SHA-256: b33af1d7e13debcf758550adfbd73388b451d773b304137041cf43911b509546
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tzoetemondje.be/uploads/files/13395632402.pdf In PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/47286822707.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/35265772540.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/55716564083.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1cb413c0a1492c2be8f92d2719cc7518/sonoxoperapejoxitajo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///36130341137.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608800b78f6f3---3482237834.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/gemejege.pdfIn PDF document text
    • http://industrialdevices.in/uploads/34400634538.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ecf5de7875e1414853e5e384c6ba9395/78473730230.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1622646973.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pokivuzozafexewewolowelij.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bgusc8pdqpkjpg34oamkgv8jk2/84272808875.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/lebuxafadilu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/59fa46a3b4600420cf802116cf5a181c/51904953264.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/jakiwiwidazenev.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/gowikagakesisuv.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93af79d172---sewepunuxojuwibosezone.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b2adf45c7abdd7be4051a46e2245c61e/44247560590.pdfIn PDF document text
    • http://360mart.net/uploads/files/pijigerosi.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/24171560449.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/62258801472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=14+tablespoons+butter+to+gramsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63E 17464 bytes
SHA-256: a3796a96b336750cb5255f2192c120fc51e28b4835a5cd9c5cb452c8615ad99e
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 10776 bytes
SHA-256: c1af3e9691acc8fadeebd0ec1a64188aa6d2c4ca075fc1030f4a4f36e1db7b98

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