Malicious PDF — malware analysis report

Static analysis result for SHA-256 3524463ec0b59fd3…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 14:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13bd213de0e850f9139990c62512bdbc SHA-1: 0a14ffc3ee7312e8d2ef946fa77eb893762f75fc SHA-256: 3524463ec0b59fd37bbbeeab9c7c3723c4e0df9853651a7500acfacb152c189a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other unknown domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358859a64a0---19551747006.pdf In PDF document text
    • https://urology-andrology.com/userfiles/file/medixewakanusisonuzegetas.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/kolosijo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3c90ad89eca42dd4740ead2c70d776ce/mebugeb.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/93771712251.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/41135807498.pdfIn PDF document text
    • http://espokebar.com/uploads/files/warurasepabaxekam.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/punobumekuropomox.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/zagowisegepupetolage.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/vofivuvexoxugi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/babemaxixi.pdfIn PDF document text
    • http://mobilenmr.com/files/files/mixugovepinero.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g6vvtrt341lcp1mfblqg7ieta5/tamewemakemasoka.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/kewijexisetemarufuxiw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c970a468f6---49778160159.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/43905461210.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f86564280---doselisijux.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/xedurodasasapalidigefar.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135be8f1dd94---54916831989.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76210514229.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/zekagopobusefe.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bibosozexumafenefumesa.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/jikovetuvezepafugiguxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cute+2+story+bloxburg+housesPDF 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_off0000be48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE48 17200 bytes
SHA-256: 91a231ebc4b48a24edfbf4195c5b2e742422aa0fd35e3f8b0f73431dad9fd5cb
font_01_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 10636 bytes
SHA-256: 9bcfc826a85f2f800c69804793c0e2d68791da889c8c147bb5f54d9c8b9f0b8b

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