Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e45d46df7361121…

MALICIOUS

PDF

87.4 KB Created: 2021-09-06 04:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a342330b2332076008d3f453f82e95b7 SHA-1: 3aa7f2b294db853ad1c1eaa40208f6dd269db59b SHA-256: 8e45d46df7361121e2db1abf3505ffd607473fa81d995bd84d31329390bc989e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=turismo+religioso+pdf PDF link annotation
    • https://paklya.su/design/img/upload/file/91642190672.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/24035754522.pdfIn PDF document text
    • http://davobio.com/upload/files/jutilix.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/mikubu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/fi0je13aj49dcgmcrmfc5ub9mv/siwotubanewus.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607551c1f23dc---9590729220.pdfIn PDF document text
    • http://jucal.es/images/file/pufaduxajadefa.pdfIn PDF document text
    • http://synowka.pl/galeria/file/63756069990.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/99421936497.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sepidujejukomanes.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/95942274041.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/23782478867.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sewutubufoforez.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609060660744b---naniterududide.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/24821690895.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/nakizukamiji.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/84738482092.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8s2alj3063h01bncm6p8i4lags/40086612037.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121769976936---54064893525.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/89589182105.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/13347147458.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/musuwukesotevaxedeziteset.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/nasugajazabosujazoti.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/v016976umfn0sjikhr83upv1e1/52064360130.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 10540 bytes
SHA-256: 7d6b3434364e7226c1da5c67a9a311c35c84d6ab0dda98d3c10ec6487ebdc8b1
font_02_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 19536 bytes
SHA-256: 1c43a71d19aca64bb86f4eb90820090d0d2f1ff66c6afeb06bea54085778b512