Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38cd51980c643f8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 19:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 174208fdd0797116d38e92d5650a4cec SHA-1: 50622df4f9e9e45cd416f002684582ef23310f30 SHA-256: d38cd51980c643f87a87b3a88f02395452b9e2663c3e2b99bb953b7d0f5af5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://archism.ru/uplcv?utm_term=dungeon+hunter+4+apk+free+download+offline PDF link annotation
    • http://infinity8talents.com/userfiles/file/kolotirev.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/wegapebogovoto.pdfIn PDF document text
    • https://dyaa.club/uploads/file/28397834998.pdfIn PDF document text
    • https://phr4u.com/files/marolofu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/97939036168.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lenesedigevolegupar.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d52369d7e---23234997932.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02a13a4cf---17554411441.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/58062712042.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kimerufitedibazebifet.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/25180689597.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/26551804008.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/80486042770.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/91626014026.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210914_F94267DA9436AD4F.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/ziluda.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/84645935171.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2888db2ff88bf6655089ef6fd5a6d737/vegukola.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/85508093303.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/wukemop.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ed4369eb708ade4059a502bd78dd28e7/midowogu.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/remeforupuvativipuda.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/dizejulesebape.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_off0000d81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81F 10968 bytes
SHA-256: a841b42868ddd0163fed0fc30cadac6b398628ec30e9b9b69adc7d3a8620c412
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 19684 bytes
SHA-256: 1d3ec7fdc58363158e0d97547ad4e321be8efcf9085e67e2713d9ec3797b3ed1
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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