Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac1c42757b97a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 09:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 844d8b6c9dc73662385d5b32e55133d0 SHA-1: 8b09af24afa0989686762056c14a2b9472f42976 SHA-256: 5aac1c42757b97a1ef54bb871b2db8a0309fe2d7f0bca44741961a71eb5db28c
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 CMS upload directories or disposable hosting, indicating a link farm designed to deceive users or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it may exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://sjar-tech.com/uploadfile/file///2021090616452841.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c0c29bde7041433f298529e141146ca8/fasajobiselogipajeres.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1a847f82---zepemukerojikogeta.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052700025673499.pdfIn PDF document text
    • https://maisonforville.be/documents/file/28677765675.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf29df6f2---vonumoturavotiwoxo.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/namoloja.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9512063e---jonibagetuwezasituni.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/renujuropa.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/849365c58283c98508469bbd7af499c6/43484377066.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/seramax.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/50685233334.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/66497636472.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160700a2a4c6a8---2697815536.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/15991498334.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/35195395370.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/64961953561.pdfIn PDF document text
    • http://beateromer.com/bilder/file/58166159529.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085835709cd6---bevanale.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/068f0a67e79dc2fb4669dd2bb160d5a5/61677279052.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kakeredaxib.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc791f3ebdc02e85e7a14752affdfa21/xibejawe.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c9b1d03c24b4eea9e44c3f2342566db8/42028861376.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/70614940945.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/26599825789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=husqvarna+snow+blower+manualPDF 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10608 bytes
SHA-256: a3de0742714e22b79640c3a818f537540c6e9500d0f6114fa644fed9a8d73d61
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 17968 bytes
SHA-256: 89538038b3779c97344e38ad4e7527fab6a635a0c41ab2b2d181061c5ed9e455
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.