Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e44edda0afa88c…

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 22:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51a3b93f73a0189a5e7712a14ac0f130 SHA-1: 3702b22c3ae11d916d2c09932f3f438e66697f20 SHA-256: b7e44edda0afa88c2f0a40e5ec0f631d582bbb1a47630dc4f56a1907f67fc5bd
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests an attempt to lure users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6vfisr5ssbh4g73qvjq0e1ikh0/ligunusis.pdf In PDF document text
    • http://learnazia.com/fck/imagesfile/32787643415.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/76684317169.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/joxiribojasakigugenu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160852daac70a6---54992809275.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6ffc086e---pegiwibagomopobajijeb.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/84837828689.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/a9u0rpgb3vhqu03n105bano7bs/4896868564.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/xukigepewuresogedikiponi.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/jozorad.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/joxiwi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/2889eac1cb0c461073f3804136039e94/zimejixu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/eb3p20mjmlfc6t694pmu7v1nem/68614202564.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d5cc54df247fba3a562bb540fa7bfe27/91083578931.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/mipoxutobefufikad.pdfIn PDF document text
    • http://kme-kme.cz/files/file/vejafixosinuwekugar.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3380293679---21344150448.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8a2db470---dukako.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/dulubonemilurilemiro.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf34fb041f---badanajotazosuwepi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fd14e9f7a4003f7dfbda2d98fbbc8384/93247394580.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/riparokiwixiluvenir.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd319136a7---27435796633.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/25251893178.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9358530e---70465923325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+updates+2021PDF 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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10836 bytes
SHA-256: 44dce685acc285006680fb0c531fe96d6acc78c32a6e3bb22a324f762a750774
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 17264 bytes
SHA-256: c79aadebd29d04649aa7d2b6e792cbe2a137ebf5eb89eda957ed813afdcc7444