Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8154ebe18ec5120…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 15:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4652c9457dd250cb05f655ed1d56a6d SHA-1: c0d61597a7f7870ad6f56bba252cfa74d130e608 SHA-256: e8154ebe18ec51206c4b4b4d99e38eef9a5cf1da90b6b4165944a136e5d2b5ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/95ba06c93293b557abdd20b44e5503ed/xuboxew.pdf
    • http://whuntex.ru/userfiles/file/rufedefiporo.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e8a9704d6941c0a83e4a207cbea4a894/tenij.pdf
    • https://haidangpc.com/contents/files/tubogot.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/84ac2038d1074442bee10ecfa2d76e26/1543363910.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8900cab904---59343599568.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc11f4cacd1---1159447497.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/78509c50ab7e9274abc6f5766554a9ff/dezaxewazivafezu.pdf
    • https://torgradio.ru/new/files/file/dixixupimubarufavidojix.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608386f734134---69198608437.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea52a34b5f1089ce249d0cd491638b0/21118098866.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/7289018817.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/871087cc32c451d391965c240df451bb/10814047937.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989b3d384a3---75591433312.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210606_45887C09911DB44B.pdf
    • http://inlygiaylynhua.com/upload/files/wepexavugoxavanoru.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b78d902a8b34405ead7b6b691acc9141/furonobu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/mexiradabuxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=evs+class+4+question+answer
    • 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_off0000e13f.bin
b04ec8abfaca8df10f2680ab53251a76240c8459b24c4513f703e44339c76597
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 10684 bytes
font_01_sfnt_off0000f9fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
font_02_sfnt_off0001120f.bin
3e4794113727085995010731ce3766d0f2664774a91fc222e4477b6ece656312
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16920 bytes