Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9b110435931212…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e7b3f9462ce227295cfed5e78498d6d SHA-1: 87eecb938c4aeb09df0498a7afe6fbe359c80fdc SHA-256: 7b9b1104359312126aebfa00af9e7aa679155e524a41ac329729f93110f0fd15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious files or redirect users. While no scripts were explicitly extracted, the nature of the links and the detection suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6adae54fc---95482818374.pdf In PDF document text
    • http://cristal-in.fr/userfiles/file/nobanojirilexigewola.pdfIn PDF document text
    • http://poorclarescork.ie/images/53802992262.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/88537010906.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb60e77ade4---metabalekinefulix.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/45938965661.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ad95eedf3c0fd28a27acad2cd808657b/58816566718.pdfIn PDF document text
    • http://ubest.ru/images/file/37905199278.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sokisasizoduwipiped.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/32575929794.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/73344862529.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2ae5cf60f9d45684682b8c28c2aeba53/pobudipubumiti.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/13302546097.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e0af2310221f7257a9131596b4f3fef0/59174210735.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3785d70da231f9f32ca9359090b14d37/fofemewovukidipaw.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd19cbec6---zoxigudurulaworafegim.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/89842563382.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729ade8acb6---zewirinageve.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3070e03a9ae152d8653c98f503ab5585/63808218563.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/52438057532.pdfIn PDF document text
    • http://www.moyekolodin.com/files/rivat.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/dmtm8gsqgni4h0qkmipskkrns6/fabozojasegu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/imcg3j992dcpqfec50boro3f9v/58470531172.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/60159321478.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210627234615.pdfIn PDF document text
    • http://asfalon.com/__files/file/16679318843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=foot+and+mouthPDF 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_off0000f1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 17944 bytes
SHA-256: feaa569f3d8ddebe0cd0f2df6df6adafe756349d321b82001ad563a98413a47a
font_02_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 10052 bytes
SHA-256: 173a654883233beb10172840683f1aa1a2ac59a7a7ae07c6e6663728dbac79bd