Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f3948ef8f888f1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 23:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 380c6c5b16ed826c87f375744484c00c SHA-1: 4b4855e5e1fabf703e81125e07419eee7f04c9fa SHA-256: 30f3948ef8f888f15fee46694b4cf362dcfac805fb6e83e937b8d86458e4f735
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload via the embedded JavaScript and link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://akanaymatbaa.com/calisma2/files/uploads/37711940251.pdf
    • http://studioarclab.eu/userfiles/files/93050025195.pdf
    • https://eurosan.pl/user_images/file/tizadonugaboreva.pdf
    • http://nebovsem.ru/app/webroot/files/files/fogolakamise.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/silapagim.pdf
    • http://irfanmakina.com/depo/sayfaresim/file/zuvimikikake.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/3c766835f6e5a347be9e2c84de1d8543/46521652659.pdf
    • http://albarossa.jp/js/upload/files/madadovugesivisoleroz.pdf
    • http://koreaseowon.com/ckupload/files/tiziwabupunum.pdf
    • http://china-spec.ru/userfiles/file/valegijiw.pdf
    • https://kopari.hu/files/file/lifejujuritupiwu.pdf
    • http://thietbiotoviet.com/Images_upload/files/tivoreboseviboza.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613796e08b6c1---bewivukurakoli.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/sabizasimometifapabawe.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f7ae515602888bc5713c2a8aac54eccf/ziwujirunejefeleki.pdf
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210907_1311CC4358F1254C.pdf
    • https://galaxytraining.examinationonline.com/files/79878584260.pdf
    • http://miass.realxenon.ru/uploads/files/bobozidibonologe.pdf
    • http://charmingcurls.se/upload/file/41630600895.pdf
    • http://standdominica.org/files/files/64304493154.pdf
    • http://investgeorgia.ge/userfiles/file/12280042156.pdf
    • http://standdominica.or
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+quiet+place+2+full+movie+download+in+hd
    • 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_off0000b875.bin
0e2531f37c1746a8dba7469f49b8884de95980554b04574e2e1aeada28bc52d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 11116 bytes
font_01_sfnt_off0000d216.bin
a9f19e9b7fdabc22ecc462b04db9b70e96424472364a06796e6089c153685e59
pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 16272 bytes
font_02_sfnt_off0000fc1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes