Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44823eefa556487…

MALICIOUS

PDF

89.3 KB Created: 2021-08-10 21:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2efeddc23fe4071e7eaea991f4b7064 SHA-1: d4788cba000c13332fdedd7652b57814d9c25a60 SHA-256: d44823eefa556487f1430edde62c8573413de4246e3b42200ccd28b2a498e2bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6841a7678350b451a825b9bcda3367d2/goredugagarerotawi.pdf In PDF document text
    • http://kssi.ir/public/userfiles/file/xavizabogusejagevi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/135f8h3e0ng07cqjuquoatagd0/16367636721.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210614143534.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df1f135e5ca---34881577202.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/pekozuzenolepevobamelo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pojoralarinivowikak.pdfIn PDF document text
    • https://nasikampung.info/contents//files/kipigul.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/fojozepoxufofil.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vovunedoxix.pdfIn PDF document text
    • https://mimpidia.com/contents//files/wumef.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd42b2b9ff---18165621171.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d7709447---leselibaminuxeluneso.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/tegikugimumebebilodaj.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/299214f0765ef5d1757bc48cbe6dedd0/19034885284.pdfIn PDF document text
    • http://centronegozi.com/public/suwubatuwanaxij.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/jupokur.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bv9oqobknh40chpathbllml7a0/rasutinine.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/kiviwinutamuresemasugov.pdfIn PDF document text
    • https://schmitz.cz/res/file/70452448391.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/6020273882.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/tujmubida4ddet21fsqt5dco7s/48486058696.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/aee25be19b1acd210be2e587299bcce2/wowexogopureb.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/81056898711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=transformar+foto+en+dibujo+onlinePDF 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_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 17820 bytes
SHA-256: b018e9045ae041b0a4a0b5a074cada4391a18484b0378e2e9d1bd5315f754703
font_02_sfnt_off00013bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBB 10848 bytes
SHA-256: c97bc22069a085c9a8a2bf6508c17f6719941f7baaed71f7ad65e201a25aa0ee