Malicious PDF — malware analysis report

Static analysis result for SHA-256 400adc8666823f09…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 23:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2914a9c5ea008b7c0aaab7f790340cc SHA-1: b5f1ddb76bf020271135da1827025af1fe2d51b9 SHA-256: 400adc8666823f097d6873f45c860153b4815d2f9b0cd8745a0e65e082495b54
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=mmorpg+f2p+android
    • http://onlinetradeshow.ir/uploads/files/16991074814.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/89221591824.pdf
    • http://anpo.vn/upload/files/95407154819.pdf
    • http://uitvaartverzorgingsindex.nl/images/uploads/4825209385.pdf
    • http://alburigiott.it/userfiles/files/dananeda.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89704502421.pdf
    • http://avision-italia.com/userfiles/files/saxadif.pdf
    • http://giadinhmedia.com/uploads/files/18798128716.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/94387632836.pdf
    • https://lacaune.hu/userfiles/file/52740603538.pdf
    • http://hidrometa.com/images_upload/files/75962698569.pdf
    • http://allier.proximeo.com/ckfinder/userfiles/files/6752667356.pdf
    • https://webmakler.org/userfiles/file/xubabasotetokijulo.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/20064241019.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/75350987931.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/nifanakiso.pdf
    • http://ajivikafinance.com/userfiles/file/77775374447.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/13376896949.pdf
    • http://tulga.ru/editor/files/25464865163.pdf
    • http://misr-consult.com/userfiles/file/15539825229.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/dfphj1lm1ab6hg8fur41hm5f9e/vosule.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0b2d1e02382a2f82fddf6bcf54ccc00f/41765814158.pdf
    • http://szakkepzosiklos.hu/upload/file/86462878928.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c0ea6585---66185028026.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_off0000d310.bin
5ffcac344a72da5c0efcd27e800388acfe6a88abf3c693f827f518a126b02603
pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 16892 bytes
font_01_sfnt_off0000fedd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
font_02_sfnt_off000116f4.bin
f87c6017be6eb1dfa61fcff8493c1f5b1f0a65e95fe7c138d26f90d3a31cd07c
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 10512 bytes