Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15653074fbf086b…

MALICIOUS

PDF

107.0 KB Created: 2021-09-10 20:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac708bfc0636e2ae22cb7938113b9e9c SHA-1: 517e247980b0b61c95a583e753d1fc10e62ef830 SHA-256: f15653074fbf086b0495a949702cb59b763a29ce7c672e1ce75d2ad4024560f6
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 a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=papa%27s+wingeria+to+go+apk+free+download+for+android PDF link annotation
    • http://canphantich.net/Images_upload/files/43242393628.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/sisix.pdfIn PDF document text
    • https://netpage.info/userfiles/file/sarutijafuz.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/suzunegutuxugifipafazulus.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/72805792170.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613857fc9d735---kuzineve.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4aedb64e---fadedu.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/pejidojutovaviro.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/33058365560.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/65523571175.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139aecf9b470---14514006455.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xagawopubotusoxax.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/rekiziriw.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/famatedagal.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodetukatum.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/fugavabizedorewulebil.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/mapizerijalovumimuv.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/5748652714.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138624d05aed---94733849952.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gemomalavimuvaw.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/wogimemalijakazupi.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/86660551169.pdfIn PDF document text
    • https://orrizon.ru/images/file/pozamapevofesivak.pdfIn 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://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_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 19640 bytes
SHA-256: 93591233a5dceb2c8adb111a2cbf28c6d75da647ef0bd170e7ddd808fb5a8b46
font_01_sfnt_off00016d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0C 10884 bytes
SHA-256: cc20d3661542711443beb4c1d7de92c0ece154de3da773100366fd5e53b32af2
font_02_sfnt_off00018646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1