Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d9dc3fee0b74a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 18:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 97e7d73174ddd5ae46c17cf45bb95cf8 SHA-1: 57ad2046738622952138a582949c903d7ad43f5c SHA-256: 261d9dc3fee0b74a06911c89b2f857cdf6ca45414d9e395937e582a4d861c40c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of a link farm and compromised CMS uploads points to a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ketchas.ru/uplcv?utm_term=pre+writing+topics+examples PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf6ed7b6c---83802938822.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/52043305700.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819a8ac400d---57632111378.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/70364691710.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fa24533c0a87fbacb9987ea08929c0a1/xizur.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39278316533.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34c2b559---damirenelifunakivitu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0eac31efefb63b26e8ae42bb19abd3c6/sotujogoni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075749c818d8---kanusopizamipagal.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/gapamubebabegopipijefas.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c59vle5oe2p1fi54h4984ebgh7/46585162089.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/65441441990.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d15c38c010d34a994f23fd9558b17ec8/rurerepirezezagukiwofug.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/86525759148.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa5f89504---kasaraza.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bb12c2dd---tofumiwevixufimijinapu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607870f511df3---kitajulexodavenob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d775d6fa1---rexibuforusaz.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a1c76a19---23682153318.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/2dc8435222843641e8d4ab7d93c2e935/kasedavazurimivigugar.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e6668564---zabojarigivew.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/dokefogetofogopav.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/37176564323.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/3861206168.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/53525699505.pdfIn PDF document text
    • https://ghnservizi.com/file/xuzefolovatubon.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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16696 bytes
SHA-256: 7dea233103f193d3f549ba8e11ec10e0ef21d1ef8e9619c6caa871fd6bfcdde9
font_01_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10908 bytes
SHA-256: aaaa1e27ca6a42a50cd784911f79de4e4d8463fdb4616644b5eb496234f9f24a
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1