Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d4d1d7d73003e1…

MALICIOUS

PDF

90.0 KB Created: 2021-07-17 11:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a24c3f025599ee3906794a59eab8f881 SHA-1: 427164bf217a345a6d8dbcde1faacb4921879801 SHA-256: 10d4d1d7d73003e174107e666ef92fa98ab6622d1a4cc1f243d2642eafc01cd1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7b04b434---mitekekamitefago.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f52e31e1---weferekanijaneti.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/96550133921.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/43ea495789f64163f9e8536c28eb3a68/98053164397.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77386033017.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/736897653.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c74be2715---vesugilizasul.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/rorekilewumepuribepefem.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/ladulisalezimuf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/87dbf390b2288e0382970f72ea30464a/9333048204.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fatewesefil.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zijalomagu.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/12513866437.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/36866751138.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2udtoudjh93nv9opttuf5peha5/73179414537.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c82ab0da2a7ee7b5cbf2e5efdf127c9e/xitubatitumabimekum.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b223eda2---39925339944.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/67218705601.pdfIn PDF document text
    • https://medtek.vn/storage/file/vanagipitamez.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090940c8f909---28867151620.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/80714212078.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/wamobotuwiwu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/27318929212.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/xexezemop.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/81890358358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cbse+class+7+history+chapter+2+questions+and+answersPDF 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_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11396 bytes
SHA-256: 130c9e4fbd01d9c8f6ed840b98c44a75dbf0c67bb2b3abb0435066b80ae34a89
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17316 bytes
SHA-256: aa42842ee70009be6bb85fa62c341a0432cde2a5e7082dd9b0a640f15525e7ca
font_02_sfnt_off00014257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1