Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9662c3fdcc73ab…

MALICIOUS

PDF

96.9 KB Created: 2021-09-06 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39d3b1a54efcca3fbefb182dca40bd6e SHA-1: f0b446bd27b49432beb6773c46e00cbd852bfeef SHA-256: 1c9662c3fdcc73ab750d43fd6822de6450b3f89fb737a0b4918e9b43de7e176c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure as a link farm on potentially untrusted hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=inherent+powers+of+high+court+under+crpc+pdf PDF link annotation
    • http://rheinmotel.com/userfiles/file/18739478710.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/liwemedabebelojofemoxebox.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/62162855782.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wulurupefobilose.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609203ce1ccb6---sebikikejoruvamex.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/92350996866.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c5cc265c7---lugejitefawafetezuditonew.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/43298094072.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/kemapodunizoraz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc41ba70d68---rugasipufumekamuf.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c0a0b0b55ee93e041108b507f70c8137/tanatiki.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108021221279389.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cd6f156e---nelififujanopoboxej.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/69240934236.pdfIn PDF document text
    • http://www.bash.cl/media/file/89981216578.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/42026807090.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m63r880p32nd1l258dq48jqf4/28005619224.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f31111c56332bf76b7fd4588315998da/tagubedudif.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lepapu.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/biput.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/95674001117.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071656800a56---7358278568.pdfIn PDF document text
    • http://www.grifin.sk/files/rebijujajadegakelif.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_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F34 17736 bytes
SHA-256: cbd01c148018d0c8f013b599736d396eea735e707d9f92a7a3641f05ec8b0b02
font_02_sfnt_off00015d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D43 10828 bytes
SHA-256: 6a69c07f3fdc3c675b5b8f33bdbc985457220b558f88da6082d1b449151fdd5a