Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc5aa6f324e01d3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68a5d12c675993545c2d1f87a3f0afe9 SHA-1: 642df724305c5b5a80d23fd6cd14061368432b2a SHA-256: 4cc5aa6f324e01d3e2d55855834f13be45d269702cb25bbd88c2fe0210ddafd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users to malicious content. Heuristics indicate the PDF is a link farm and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests an intent to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://irlanc.ru/uplcv?utm_term=how+to+write+text+on+pdf+iphone PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6bd0ea10---fazetiwetadikoxatogidi.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nanesuxilekatovix.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/f84ac6b6a1b51b22e089e2101e6f6aac/vidabovo.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/40970577255.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pivumuxemofejugonaledul.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/kegafojiretile.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cb9a7670---wuketusorazafiwozibisoxo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/muwasepukipazodaxetib.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/ropowegobosobefa.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/49181958821.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/6593176181.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xagatovalafakabedopek.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/93222877504.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/193647f99ecfc08f80d79ca49c7ea18c/71327758167.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/japojirelibudidokozugamu.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/bolizuz.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/45746624265.pdfIn PDF document text
    • http://ingore.cn/upload/files/birijekukuzeletubaxet.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c017d85a70f---32931598067.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/80181893793.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/55415903948.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b68e308b3---99624834775.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/33407485965.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/il24su993dnuj3h2e63kk8quo9/bibepofodasarivako.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/91035126184.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DD 10396 bytes
SHA-256: b287528b30ae764f1bfcd419332fa465b55340ae82feb0c65c42c9ede5737fe5
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 17692 bytes
SHA-256: d2d16f1a178d654008f7788d26d2b7df5fcbfb7b666788b676944ae2c00c5c93

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