Malicious PDF — malware analysis report

Static analysis result for SHA-256 80628e8e0860f0b1…

MALICIOUS

PDF

108.3 KB Created: 2021-07-07 03:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 451bc2436e10876b4d77815304a89a48 SHA-1: e288f86db4679671210fcb75b9c797c40eb2212c SHA-256: 80628e8e0860f0b17231fd58355541df23e45204221b367fb159284eec6086c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=dr+anand+jain PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/85992771436.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/468b25108dfa3e11f4233cf95024adac/woratafubo.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/69835649715.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7fcunkpp6kium656ucaubd4640/43005189800.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994c5109d89---21893980998.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770f10a6bd2---9297391820.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0215ec557132a9929be3be74ca0c8c14/26648015331.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/18119835341.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098ade99f0e5---80529354797.pdfIn PDF document text
    • http://willbramephotography.com/kotimenaritilojo.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d939ac4c9---9779647397.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/80291994265.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7791c4e3---busituzovolobozojire.pdfIn PDF document text
    • http://www.asslar.de/downloads/fumufumedi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948881a0593---39389468899.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8bf1djlg39kmu6ilgbdhnehc3h/74935654694.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/fazif.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/83859263d46370b89da5222232d4bcb3/zemusidovesutativovowena.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/87830560498.pdfIn PDF document text
    • http://kfbi.ru/content/file/fipiwepalakenov.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/rebizolirutotiralex.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/64538785479.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/90323020801.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_off000149fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001620e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1620E 17040 bytes
SHA-256: 36e96c8e572a843880ac2fac65ff9aa34ac2cc7dfff5e50eff290eaf058661f6
font_02_sfnt_off00018ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAD 9808 bytes
SHA-256: ad5f0a41911077a2fe10ce807671946ca489345e188b01d7a969f91472537271

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