Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe734009d960d041…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 11:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d823c01cc2872800f04b6387f85774f8 SHA-1: 59fdd20e737dac6c6482c74f78d482ff42f0e3cd SHA-256: fe734009d960d041e843b79fe46a0ace68627819d2aa9feed075803461fa41dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to obscure the final destination. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links hosted on compromised WordPress upload storage, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.travelwithtaangoo.com/img/file/27158451814.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/konezeja.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/17170032449.pdfIn PDF document text
    • https://lecachet.fr/docs/files/15156934129.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/91128927526.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109091525301299.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/sipabinaterovan.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88043997254.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f655592bf8---zizeberedoveviv.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fopujilolobul.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/99498722955.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kekafi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/zuraxunutirafegitono.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/supepikobimebafigakavepa.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/jeget.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/57447072174.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/69810573326.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/81378121212.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb26c9994---83319989686.pdfIn PDF document text
    • http://submission.jpvm.kr/pds/userfiles/files/fonoxadodusebozelibapu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c98ce247f---10004163101.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/4181733826.pdfIn PDF document text
    • https://csn-alliance.com/data/files/92662973942.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/92302190703.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/12672437720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=episode+how+to+get+free+ticketsPDF 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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 17940 bytes
SHA-256: 9cc3597e6d0c7925cfbc8e0792575435fdb998cb05158617407d8553198a151b
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10748 bytes
SHA-256: d91e8c548bb877c7b1bb539f59b5765b33994e6823cf15ad5d755fd6e9b589e0
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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