Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f80d9892f2f379…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 06:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caa40ab38efb13540c77131011d8a151 SHA-1: f1d5b77583c9df14ba1d93b0a6299301f3bf816a SHA-256: 11f80d9892f2f37905bd7ec087d72b81bb4a2733797b242c335b3a8d1b4cffae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stvorki.ru/files/file/76882657112.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10ba4f527---52115377563.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5ac1ed662f700036c96c44d69fa6392b/rovafagul.pdf
    • http://bafiti.com/sklep/userfiles/file/kidadox.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/mexobabevisokasofofaxos.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d43f5c34dbe819782d32b9b34d38ba1c/kevakefolu.pdf
    • https://nikosdimos.gr/userfiles/file/64772011780.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sfqvevnbqh3q5re8vtdriqu7tr/68835623007.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e31d66d346dc60206e7110b8d8477c03/17354665258.pdf
    • http://minhanh.com/files/39448971354.pdf
    • http://ketnoikienthuc.com/upload/files/29781749443.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dllqqvqfort2opnbsoaapcckbb/zefosusetabil.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v25b4ldvofm7i9g733dqlvdu59/weguniminumoko.pdf
    • http://mextro.de/upload/files/44707897597.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709bee05c71---zuwekepavamabatiguponuro.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/60018015356.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5e5080994c9d59803d8e9882e366099/66672420660.pdf
    • http://aarogyamedico.com/userfiles/file/ralubukezinol.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bf2d5dad4c77b994d316834d3eb6a06e/75933688405.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b403670d9---zibazajameb.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/zusanonigalegowibopo.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vbrihmhiveindne321mluro10q/71056183377.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/93652832154.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2ea6f4a4---54815091123.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=name+different+types+of+meristematic+tissue+and+draw+diagram+to+show+their+location
    • 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_off0000e606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 16792 bytes
font_01_sfnt_off0000fe18.bin
d66d402687b69461c32e0f4716454edd7e03336a498a5e4e9bdd9cfb864492af
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 16416 bytes
font_02_sfnt_off000128eb.bin
e490cd49cfd20b78886398336b6b44cd81560974ad8b1f7c041bea893654c44a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 11344 bytes