Malicious PDF — malware analysis report

Static analysis result for SHA-256 757be8e193bb0296…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 19:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dda1ac87be269575a188aadc6222de6a SHA-1: d0282f6ccb9d14dd1f3e6679e7f9b15d12dea495 SHA-256: 757be8e193bb02968218fbd62a999e3810391e05dc95c1e73dee560dc9316505
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to download further malicious content, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mobilaide.com/upload/editor/file/11997725643.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e05a023c---sewuzowa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376747a5dc9---71043166131.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/98339948800.pdfIn PDF document text
    • http://inica.org/files/file///78507071893.pdfIn PDF document text
    • http://chengzechem.com/upload/files/84731516170.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/bopomupa.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/nagadovagagu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe205f3f95---zopevajazopekaket.pdfIn PDF document text
    • http://gardatrans.com/content/Files/73986883559.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/68703001597.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138374784af1---safabizew.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/4628111615.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/9131079559.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/towotomepabi.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pamapagukepuvapo.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630465280cJg4.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/jafasivuxuvasid.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/labev.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nafovekopabujifiwu.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/wanal.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/datazexagojuzevasa.pdfIn PDF document text
    • http://coolscape.info/images/files/nopijogakijitivowaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=composing+and+decomposing+numbers+worksheet+2nd+gradePDF link annotation
    • 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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 11484 bytes
SHA-256: eeaea274801de53b7f37a96bb22937ca29f432701f029ac904f60fb71923445c
font_02_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 15772 bytes
SHA-256: 752720e36e6ef7a14c9613a282b803b105fc5217caa0686db78512739335cd81

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