Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf58f1ca75db3b35…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69672959d52136a6cc39b2a15e53c9a2 SHA-1: 74c5107fa65fa0b042db472ed3d8b737e1607c6b SHA-256: bf58f1ca75db3b3594fcefa2ca8ccc10b59adeb2affc4773a17a3b174eef01da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on compromised WordPress sites. The primary URL, 'https://nomylo.ru/uplcv?utm_term=hacker+baba+virtual+space+download+apk', suggests a lure related to downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=hacker+baba+virtual+space+download+apk
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2c9e7e48---gibomoxa.pdf
    • http://gelikonline.ru/content/Files/87411965539.pdf
    • http://progfin.pl/userfiles/file/99856797061.pdf
    • http://mindatpeace.us/uploads/files/81350634187.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/zuzerosol.pdf
    • http://elitsatodorova.com/uploadfiles/file/80828002877.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/kosudezamurutuwe.pdf
    • http://l-max.ru/userfiles/file/75630788780.pdf
    • https://rsebolivia.org/userfiles/file/purarosudowazilenuzuja.pdf
    • http://zenkatsu.dk/files/wuzomenebipatuwoni.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/bupiturowikarazuwe.pdf
    • http://movesearchesuk.com/userfiles/file/66308749155.pdf
    • https://zbmbudomont.pl/userfiles/file/39248183323.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6a09d51a1c055aaa4f76efaeded9ead6/52591607679.pdf
    • https://priscar.com/documents/files/gamekopelaxavuvokivi.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/dasowibozikegabu.pdf
    • http://frutapac.es/ckfinder/userfiles/files/85245564763.pdf
    • http://kamerton.nl/clientfiles/11194118771.pdf
    • https://hr-serdahel.hu/images/file/59232717375.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f09948d0---72451931417.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/73053316228.pdf
    • http://kfnmsz.com/upfolder/e/files/20210910225447.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8fd945bf9---voguvek.pdf
    • https://x-leather.com/radsportfiles/file/felulufiwejewux.pdf
    • 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_off0000d933.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
font_01_sfnt_off0000f145.bin
4ac98a35cd8c9492ec2e71a3a464c7fa118c0db5f6889f2186e6f49d41638006
pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 17360 bytes
font_02_sfnt_off00011e49.bin
3fef35943eb9efc2645005eeef92373f49d40d77c85f606335a0254f0fb490ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 10984 bytes