Malicious PDF — malware analysis report

Static analysis result for SHA-256 735fd1199bf13283…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 20:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4977c4bea737b33da0fbae096e2db66c SHA-1: 3ba7068685ade43471c46d34db144744c47376f2 SHA-256: 735fd1199bf13283cf13efea9b9e650c35fe90830dd8d3d5eda8bf4718ba996d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, but the presence of numerous external links points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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=be+a+network+marketing+millionaire+pdf+download
    • http://anthonyvienna.com/sites/default/files/file/31930261427.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/37821458c9d0152b515fe1f6b51e8957/rogolagasaruzatu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983edf5727b---xetowuwajusajexerepul.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/adcf92e99e976cffba4dca037382e579/41260161016.pdf
    • https://decoveinvestment.com/userfiles/file/renilexexaginekowuzejugos.pdf
    • https://baongochoa.com/upload/file/bopifif.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/07t25j9ud0ao31b6ruugfga891/47222918792.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/mhr075nq85js3k2oedlcco8uc4/sumawizisitora.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/vsc3ogkrutkcna1f0mmsfsuttd/xomiviz.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094976fd0d96---36052368382.pdf
    • http://a-mega.ua/images/uploads/file/zikaxa.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d121150927---32466319084.pdf
    • https://evpersoneli.net/ev-personeli/file/10432476650.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/de4c3b381d16246ed5386770b89a2070/28444308616.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/647952223820469e2eb99a1abca5d151/minijufokuk.pdf
    • http://africareview.in/userfiles/file/44261417343.pdf
    • http://auroraenergyproject.it/userfiles/files/lunafefivinudamozo.pdf
    • http://babamoleskine.com/files/file/mapita.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094319038095---rozomakibato.pdf
    • http://balcimimarlik.com/resimler/files/ruxekadavofasezima.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/5176d613a0d7ec5e21276d794823e849/77062779112.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9492bac527---30913386546.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m6vkckaabu4vl93a6g38p6bq3r/8666136365.pdf
    • https://weddingitaly.jp/images/file/bopidepesezamesibubese.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bc689b81181---ximadobezefer.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 16792 bytes
font_01_sfnt_off0000f1e4.bin
0391a41f581e43332832ac7c1ba113a76b4f2dc1718e141fdc97d278f596a8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10904 bytes
font_02_sfnt_off00010aee.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 16092 bytes
font_03_sfnt_off0001202f.bin
976bf89c03ba58d5565568eafa7ea4121fdeec5b6f2948108dead9068acc9757
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 17576 bytes