Malicious PDF — malware analysis report

Static analysis result for SHA-256 83723bd698588b0a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 20:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6c47e33570868f7e2a40df1218acf07 SHA-1: a2667bfe08cc60bc13de1d20b2725dcc7bb07404 SHA-256: 83723bd698588b0a4c5bd33a3c853aa16e6f1f07bf441384c55725df4a4d5991
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a fake CAPTCHA lure, a common technique to trick users into executing embedded content or clicking links. The document also hosts a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing pages. The presence of external URIs and a link farm indicates the likely intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://allytemp.ru/uplcv?utm_term=download+fall+guys+mobile+apk PDF link annotation
    • http://sushiosushi.com/uploads/files/20743162221.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/41131753220.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xofexexapokanobalosa.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/roxasexilawuwer.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/54652539632.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/33529648471.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/8361333781.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jojaja.pdfIn PDF document text
    • http://cjatkinson.com/userimages/jomekasexepadar.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/pulopikedonesovixobeb.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/88509676551.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/11352089152.pdfIn PDF document text
    • http://lj-group.cn/upload/files/36799162397.pdfIn PDF document text
    • http://tayles.com/uploaded/wulokuzubosunubejogi.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/76662072269.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/roxejomeperibajeketodevi.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/5837168738.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/49474384572.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2ea78f4c0bc9d816750056d1d80731be/xelibetogezo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131776ea61ee---85101346431.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/99840ab27d6464a711f1e954100af8da/kalosirebez.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/5e26f906c4a1c4ee91be90b5c122b19f/993253539.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/44059450288.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/35137739948.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 17848 bytes
SHA-256: 22bf93d979e25376f3440964990a9118e3ff6b1597253355e12fd651df7f6f01
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 11176 bytes
SHA-256: 75b950cd1dcfb478d7b046b36d4bb7cc175ffff95b2348b3a426903543872c2b

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