Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0f1f3d46fbb17c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 12:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef5e9ef97110400c279b890dea3e7f15 SHA-1: 0878d91dad1403289dcb3b20c1679a03a1d18061 SHA-256: fa0f1f3d46fbb17c4b8569090426426b2b1e90d57d5ecfa19f7318b8f95defa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=hd+mx+player+pro PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba878d0cc---daxuf.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/54171794773.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/vabawazapulilalidifisuf.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/dudatifufiga.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/66674859203.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/18810113438.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/70811255519.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/gujizusunibirijujip.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/kajurojopobolojude.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/64504697840.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/38639600885.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476b48ee3bb---57051020205.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/62056636270.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfb583e9af---zafakamakamububadebofige.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020009084313.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/49012392886.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/rupesiner.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/koledakerozak.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2c69d99501ed4e459e92c3bee24dc923/kijipiwituw.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/64116328341.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/33133767915.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_off0000b2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C0 10296 bytes
SHA-256: 7d961f1e41f4d85466ddbcb713cd11c3c1263a23a91e0f94882b8253f1713e49
font_01_sfnt_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 18348 bytes
SHA-256: 535fa8c9e52cccbfd95e77ef9c374e31fcb2fbded10c593e1dda996d6d092c46
font_02_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1