Malicious PDF — malware analysis report

Static analysis result for SHA-256 844ea96f523bfab7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-15 11:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16077cd6e207e0c519713b68bd7cebaa SHA-1: d6e4cdb1887efa39f2a67d6c79ae75e17ee486d8 SHA-256: 844ea96f523bfab7ffb94befa199b2c3c59791774db48ee3686c00a711b5f0fd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=kissing+baby+on+mouth PDF link annotation
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3e2e76232c601f7cfdaa498e10ed7e68/buxur.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3706257bd8cb949145fbad1e47e06efa/nerezaxekeg.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210605_70FE844B2A3C03C8.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mulugebovakog.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/64319405791.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160962ded3e714---jefaduvatofezadurevolavi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f3e9f4a7---janojotewomurerimoj.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/308ef3e67d8ae053b752aa569db9641e/98347695572.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90313e64a---45353631327.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/nagapijavurudijenijo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073783035295.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/wusafopivovupusowosulu.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/4328423801.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc4268c05---zomuvusawegifomukox.pdfIn PDF document text
    • http://alkanboya.com/files/file///pumuliturijovedig.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zavinodibugosezunemol.pdfIn PDF document text
    • http://ave-france.com/pics/files/86944363064.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/luzol.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/vdpfpnd3gfs16r9qqc10j7gi6e/galunumoxikazil.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/putofoxanibu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/98950977990.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6b17084c9052ddedfcc9807ea03ed49b/41953479394.pdfIn PDF document text
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/37159046564.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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 17464 bytes
SHA-256: 94833292fb472bdcd7d6e8b8aaccf36f89c2d83ddb2132a7b15e52a21ce8f3df
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001337a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 10620 bytes
SHA-256: 9fa5a842696c4613d1d4e8e7033bc16d5528d798ba14ceb8892e366eeb62ccb3

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