Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ef9635942e44e6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 03:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d6e0ba0087830a63d20034d1ec48ab2 SHA-1: 008b3219421aaa75b529bf3b65d22a86a8b7c39f SHA-256: f6ef9635942e44e62e821df346bbca7c7ecf688220a41da5e9331de1aafe6e26
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 domains flagged as compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this is a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://bdblue.com/ckfinder/userfiles/files/91818949274.pdf In PDF document text
    • http://nhahanghienminh68.com/upload/files/tugoxirilatupudu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/56090670924.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c80237e3f---38166527456.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/rubejax.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/89133459635.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lisimigomep.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/64980928237.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021091322334741.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/88697701927.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/xegadivafopopumezudeduve.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138507204388---botexexokomuwut.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/jibegonozekab.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/3831697490.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/88494867433.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021991332542130.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/47311532540.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/97190953522.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/65216089857.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/65726359002.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf0317e9ef0172f2f3bab6be668c4e4/nudoto.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/65467429700.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/91650013248.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/kepamezexa.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/motew.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/59224485543.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/55906914699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bbg+post+pregnancy+workout+pdfPDF 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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 18088 bytes
SHA-256: 6c3a1d928659f74f3272f4d26a1006bd3bb3edd66766a8d3aa9d9024e9670675
font_02_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 11244 bytes
SHA-256: 615d4525b6eb1ff19d6f53bde3f8e27bc19377a14f960a1ca8e883235371393f

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