Malicious PDF — malware analysis report

Static analysis result for SHA-256 722de68d38f5e509…

MALICIOUS

PDF

84.7 KB Created: 2021-08-06 20:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1bbb9610cb937b4daeb46d1aecc7eeb SHA-1: 4b65c9335d0503f6675710981ad3a923c17bcac5 SHA-256: 722de68d38f5e509eeb3f9bc8e069547ad473905cf8e18884389bf40faf2f0e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links pointing to compromised WordPress upload storage and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=how+to+get+odsp+for+anxiety PDF link annotation
    • http://zs-oilfieldequip.ru/d/files/43087004194.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/29329280534.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9end5tuobor63pdoueakek58ps/wisetutuk.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac0229422---gekijaridog.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/59069432602.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/xukufuxozelejelata.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9e616d86141197e34ecfdc43c294732e/37120315763.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b078ca939---mezebagilivalusoliki.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/89871943497.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/62895644383.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfeaa7478---2181965932.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/zamuxigijaze.pdfIn PDF document text
    • https://kar360.com/resimler/files/58699743177.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c388bc23409b7d495de0709fa5989919/81698255811.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/70527837954.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac258b8402---68177366656.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k7tulfuukvjq4oh39s1b3gqn3e/76873656621.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d3bb89348---48969897130.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/tifikox.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/xixazowofudusudepenobu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/24b7ba72445ae9ea1752f7d8b9bc70d9/28462909418.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dacd206f6---20326665575.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vototuzedimujegalosanija.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f2qglgnp7kj93tjlmvcl2j5c/demimesejarefibifet.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a23104bd52b---gevoxijijamif.pdfIn PDF document text
    • 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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16108 bytes
SHA-256: b7b14d6c03ba2cea8ffa845cc765eaf0a2bc17a8eba61e64f6b990a43fb96700
font_01_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 10920 bytes
SHA-256: 8db4cb5220ec1392247827d5080061ef61a2c43f0154323f2bd59b9b1920b667
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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