Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a58564b4129d5e0…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 21:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd6f0bdd5ddddafe0375203ef30dff67 SHA-1: d23e5109ff27688bdea0f0b433ea9ee3a4638465 SHA-256: 2a58564b4129d5e0d3872bd6558c3b752aa0b337f3cbeeaa3782ed38f7826574
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious destinations for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=what+is+the+best+ar+for+warzone PDF link annotation
    • http://logo4you.dk/userfiles/file/kokof.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/36286434136.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jaluzevi.pdfIn PDF document text
    • https://ewt.cz/res/file/63566392179.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/27674287827.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8c02ead9---vokozuxopawakedamu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613703f16a0b0---dusodu.pdfIn PDF document text
    • http://imi.vc/upload/files/17122171464.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/salozopinegiduxubaroriv.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5facaa84---fulusisebududovetapovi.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/24990967352.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143776214254---85705365568.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9cb3025b---fuxapurokuvig.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/80989753800.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/vevisazape.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/kogusitezoxalataroz.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/25911037391.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_221746.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc0cccb4a8---21162598236.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140b079028a1---85199820189.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/52118022685.pdfIn PDF document text
    • https://cmf8.ir/data/file/zilutes.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/42983822228.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 18752 bytes
SHA-256: ea19d696ec6db970b6f4d386e5f52d2ec9dea44bc7e11a695bb4a60bf3cf3d26
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 10544 bytes
SHA-256: bc44ed765bace75ae62dcf76a6927c3f278b51b03d609c4d4a6014883875b1a4

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