Malicious PDF — malware analysis report

Static analysis result for SHA-256 4592ba1fe6a95cb0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 14:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 461b7cbf8f8c875c8aa2891c27f3e42c SHA-1: 44efe55e937cc3e3140badb0c0ae5979e2cc1c14 SHA-256: 4592ba1fe6a95cb0ff1436873cd72f35240e3860ad9d962db0d4bf97208ec696
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vidimobupijexebu.pdf In PDF document text
    • http://caphegiabao.com/upload/fck/file/nalalosafoxetesapof.pdfIn PDF document text
    • https://clove7.com/userfiles/file/37470569086.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415b2be3997---kixog.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/kunifokuwomuv.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/22a1cfd35a356a9e36987218b569554d/97515451091.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/72119120293.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/59013807606.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8df0cbd154aaf98efe8410a5e2b687e8/10099113225.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/49179736886.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/96843309454.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c671d921d6---39690897077.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/73200764488.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/51215049311.pdfIn PDF document text
    • https://gulamanis.com/contents/files/46206605591.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/jasigutowefugakoduwipowu.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/68083171178.pdfIn PDF document text
    • http://lejonhund.com/upload/vegikopefusibe.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/42845011427.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/jemewudonetisefasologesuv.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vibugikewijami.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/41012022100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=speed+test+cracked+apkPDF 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_off0000d542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD542 10312 bytes
SHA-256: 77d60c81cf701ee61fd61b69c1279b52bb028e01cfdb898a5470480554fe6583
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 19620 bytes
SHA-256: 9cc7dccd5b480067cf247865dc8e5f07d103cc100581ac84fbe3c6fcf9da9dd4
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1