Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf99d66551347db0…

MALICIOUS

PDF

88.6 KB Created: 2021-07-23 13:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e5deb1e78c5b20cb927d0d63094a7e32 SHA-1: 8dd204cb3f0d3a846782a89a22800db38fe0d4ce SHA-256: bf99d66551347db072fda6aafade16624cd98e1c78912119063e56af0c6e8dff
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of phishing or malware distribution. The embedded URLs suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070034bf3610---xatuteboxugujunoxavumibag.pdf In PDF document text
    • http://isdoor.ru/uploads/files/domijufuku.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vdvc4s2nf06d4g5junqj0cu4t1/jibezonirikon.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/mebusuregiwu.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9a8a960afbba61c478146dac166e16ad/27924229116.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8bdbd34e---99564421577.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/junevowipupalupugoxe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f388708e753---rusomegonatubopef.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/cb5bf8fbade0b6ca2f63844d3a6d5dec/degazuxodi.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/delulidobuvatuju.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b0a03bcf0---80473330715.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/8926304697.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/blknjfq2g4r0h2v02ibki0bpak/kebimuxuris.pdfIn PDF document text
    • https://mauspro.net/upload/files/wafivepitaregizaxoxapo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160934b79b3b4d---84878040411.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/44739096891.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f086f5b4541ddf88feb2de4dd2732b8/laluwitazawipofifadudiguw.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3481b6e3---refedejoruval.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faec2c605f---77770571419.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/wudedileperetibej.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7800fc3d4e---jaxoxakebusarofiludazo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba2840cc19---todenanurenajirasewodeba.pdfIn PDF document text
    • http://unseretochter.ch/images/file/74989420581.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kodizonitevirajonoke.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/5523600985.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/29097429246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=shack+up+with+someonePDF 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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 18532 bytes
SHA-256: 232adba539940b5a2689a5122366a40a47f91ce96a497563fda8ae035fdfdefd
font_01_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3D 10844 bytes
SHA-256: ec118f8ba2df6a885bc5ab63b0c9a5d0271f71e1ca631eea2b1b713d3a225ebe