Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c60c2194e1eb07…

MALICIOUS

PDF

76.6 KB Created: 2021-06-29 11:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f54ee9fb8c9a41128425bd300a23a5d SHA-1: 364ed13955a44e398d0359010342fbd196ff6cbe SHA-256: a7c60c2194e1eb07dc157ae32e7c396bd5fe21718c9869650ea7e2f8728ab76f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The primary purpose appears to be redirecting users through these compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://beijingxinzhi.com/userfiles/file/20210511230023_1650091448.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e0gthg54lqo64dps9qosuan48v/pawoxufoxakidikunapuk.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/zovebemi.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a98491e7---jajava.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cca9d2488---29257602482.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c89420ae14f1bdff94adc93e95a11726/43378399294.pdf
    • http://1careglobal.com/upload/files/mamudezofa.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/rikafegagapitozumu.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eeb4329a8e6a57a49aab842ea0cd963e/60704322882.pdf
    • http://michellesmithscott.com/clients/36670/File/xabotisofedi.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be08cdb1bd---51364376081.pdf
    • https://247hvac.ca/fabulous1/uploads/files/93187562365.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/0a91bbe7fcfd25a44e2b01dc0554603a/rovomupudojinopop.pdf
    • http://bigband-ulm.de/userfiles/files/dijiwobekujovabawegoja.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0a3b583---41575406173.pdf
    • https://stmarys-perthamboy.com/upload/File/91710671595.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2ef3d3567---99248934047.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999113d5db3---dupuxifuruvesibeker.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b72858e1067---dazasufelis.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68cbeb479---guganulavuvufagagew.pdf
    • https://hamasataccessories.com/userfiles/files/99304948331.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f06a79713cf19972b61cb5f0077fce28/mimemalenijizabipinupat.pdf
    • http://studiobaliva.eu/userfiles/files/11496608485.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=seven+pointed+star
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c96d.bin
77369dc135620db4e003a60cac91209cd0eaba21752c4d85d7b6fce8c83a80e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 10480 bytes
font_01_sfnt_off0000e163.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 16792 bytes
font_02_sfnt_off0000f975.bin
1b24ee61bbf01d5d7e7bc853f7501a9a57cfec67a55dea4a1eb983a6d575b4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 16920 bytes