Malicious PDF — malware analysis report

Static analysis result for SHA-256 648f47c922995c6f…

MALICIOUS

PDF

71.1 KB Created: 2021-06-10 08:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: add8d9de4e8aab1f374cae5c5f6d1352 SHA-1: 8774f428c9dd12a0d5776aca1f73056d32407742 SHA-256: 648f47c922995c6f3b18a32c2baaa135ef821221d25d2fb961796ec02116f770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to sites hosting further malicious content or phishing pages. No scripts were extracted, but the presence of embedded URLs and the heuristic firings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=como+orar+en+el+espiritu+john+bunyan PDF link annotation
    • http://ehomeforeclosure.org/images/file/46274335766.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/a876d9da184ef77bc2bc7f77fa538aae/34721704889.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/2077107375.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705465b9fd0---xiwuburi.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4648dfa2776c00d5cbf943f1239b3ff6/62574992017.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/b3g3n2te160eotqgdac3lv1gn4/dipuveki.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/19207b7e5834f49fb13d0d518cd415b3/xofovo.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/17210dfe2dd73c1ceeb2c78d9dfd43f9/xuzisodusig.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/sokajimobiso.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842cf51ae30---sibuwagasi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775da2a7b40---33502252211.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/9i6vfng50fbskl043vs1sgidkl/likeravebunurepipadade.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/da985c27b0d9c3d7727b8db410dca869/goxometinizemitufuxize.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ctipdaupgtq43drfn1fihgb9m9/vopeberodonowejizukofewa.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/42803514549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5280 bytes
SHA-256: a47c4aaa0ed75f631d2e87bae199c5ab844670ba4d01f37d3867ece9e2dacf99
font_01_sfnt_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 11956 bytes
SHA-256: f25d844de7b2ced81a40e15c31e5bd661130c104aefc0001d2353ef40363f7cc