Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd195f1ab038ea3c…

MALICIOUS

PDF

80.7 KB Created: 2021-10-05 20:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5e5646a38fb3db75908ba11ea4428a1 SHA-1: 6556f2f314d945a271bdfd96f610f0512cf91919 SHA-256: fd195f1ab038ea3cddb567a26df9c96978b25eae7c29e48089d39d2bd7970f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=fast+food+with+best+desserts PDF link annotation
    • https://uhcp.com/editor_upload/file/35059711017.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/numes.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/84680339202.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3560b8c1---64663551167.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/73768295951.pdfIn PDF document text
    • http://hainfelderteich.at/galabokadelexit.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/17042627092.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/756059637.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/9712084127.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b04d8f85---48213655672.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zabapufivazegefisinilumu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613a6949a233e.pdfIn PDF document text
    • http://aa-nusd.jp/kizovavojedulelirolivexub.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c1a287791---narudavigure.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/11585665877.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/9582829512.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/guxenun.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614119e74aa9b---fivusefog.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/jukibapazivusuzakerom.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/67297137649.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a03096a836---80288299465.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jidili.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/46846171644.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_off0000d56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56C 18760 bytes
SHA-256: 60dfe940ffc89a66ebc8441aa42c3c7f8b3f6976802e3aadfae49573c9fd43ef
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 10504 bytes
SHA-256: cc1213f912bb8c474c7b209a5bf3d42bf1b8b648f6ae358ab3d43443e7bd329c

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