Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39ac6a824de4726…

MALICIOUS

PDF

86.1 KB Created: 2021-09-24 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c1e5f5f0cd2f97a109b421d50d3fb36 SHA-1: bbfad3caa402be53554bbc8a930776302eb10e8e SHA-256: f39ac6a824de4726fd1519a4fa627ad9edb90309fbcb6533981a28f490f291b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ca26a1133---93224267399.pdf In PDF document text
    • http://rayanchem.com/d/files/famodanumebirexejepela.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/fisura.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/posovogeguxewejaxozije.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210904_054341.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906034614.pdfIn PDF document text
    • http://lgassociates.in/uploads/31999554407.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0413f883---80592425394.pdfIn PDF document text
    • https://digireg.com/upload/buronefevu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/31879502479.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66586692191.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/53467869026.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jaguxa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dutivumuvevo.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/15453959730.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/20051754213.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/pazakixonu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342ab86d2a7---tidatodosununon.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/vomagexame.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/2046777293.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/83312755258.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/5397338942.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/pinodexatupimifiluwibegoz.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rodoxulurisodopadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+receive+android+messages+on+ipadPDF 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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 10956 bytes
SHA-256: 1c215e229e3fec80194830198bf2506d00ff3c4af2369a2c0c245418b408a677
font_01_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 17968 bytes
SHA-256: d5b5ecd436a51d505cb31bedc6eb3721b404436f90fa58a20216e73bd34d049f
font_02_sfnt_off000132bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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