Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a08635b7d7fe58…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 10:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 853c490c0dea3b5c5110abe3b51ee7e6 SHA-1: 13dc167d3f23b1575975a70afce0b95ebb1be1fa SHA-256: c0a08635b7d7fe587717d75c0eba714aa3c090f384e307d342a356b94d7f7c2b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vouchertiket.com/airplane/ckeditor/uploads/files/mematatirijofopazowinit.pdf In PDF document text
    • http://jubileejec.com/userfiles/files/17823582317.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/fefivokokowogok.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/kajatotinorido.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jimuxajigogixoru.pdfIn PDF document text
    • https://pecsikult.hu/files/file/nepabeza.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/sajidepavodogewomafu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/aaf40b06a31c2b05f570bd7e90193865/vemazis.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8a9db7d7---wunafuvunude.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f9fb924ce56a24767e4ef83f3390a942/50905240616.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/50953223139.pdfIn PDF document text
    • http://darstin.com/userfiles/files/58299171148.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/41155133847.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/3832305125.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/97340061419.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/9915314296.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/81322099930.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/28828147668.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151221272663.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pinosis.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/kuposazamokaxi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54c04c34a8b80089b623a34076b08db6/fuxapet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=whistle+ringtone+for+android+downloadPDF 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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 10712 bytes
SHA-256: 60ac3ff635eba652d07e5d95697969eb2efb1177744f574bce264058bd69e115
font_01_sfnt_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 16492 bytes
SHA-256: 7c94cc6bbe1fcc23115d9a2975755a1afd79327a80af53de013679bc5a7646c6