Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d015b672031bef…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8b1e8528bd9c70749936bc37b83f068b SHA-1: 930ec96dae17fe7f61f4629222b5e27885dbb594 SHA-256: 35d015b672031bef3b01025be7cc8ebfd741fa8e61b660c35ee6239766384d14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://donghocasiochinhhang.net/uploads/userfiles/file/78193063900.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd285847---90607262725.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/ad736adf7c21bdef7449f030cafc411c/29800603556.pdfIn PDF document text
    • http://farashimirooz.com/files/junaxizosiw.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/79631514525.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/ruzopexurosukud.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/minakanupar.pdfIn PDF document text
    • https://baongochoa.com/upload/file/64753366287.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffd2eb448---69414044236.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5f56af8bdacd4934d668877a96801d99/vomifonitefesolipafajeref.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pufefosovuxomadizi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a4a558a80e7fff6e001fe6fcf66ebb7e/sovitoxajuxuwexunot.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/033b372f242956e8087c340cceba2d27/24946480709.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2dd0b4268daec33fc76f8cb9cb787871/jexupenetedirelavufibi.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/vujoxad.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/30368807430.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a8329e12---72568460841.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bc1c514e---30441193542.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb85ce7824b---31554411980.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/aaf8b1286df9853e0ee5ff76d8506d7f/wadixo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2c7c5d8c---82691135891.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fd47a4c1e3655b31a7b89c320ace08e4/kumetisibawuberipowoxok.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071e26cc364b---sobupudelow.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05bb50f6d---95653918369.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/v0atfufa5d2cnjrqr12jc750r7/76596346773.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=grandfather+great+grandfatherPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 10248 bytes
SHA-256: 152cf5986a85b296597e25bfe5a3d5d8a0cb30e5992f77e37986a7b06d03b298
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 2144 bytes
SHA-256: a35eb7c21f16c468f8b3720ef5331fa24854fdd29b6acd5251ea20a162380614
font_02_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 17560 bytes
SHA-256: 87b1731b82769b5297e9443c955b7fc004714ee4a67e58d5b4d7860209e487dd
font_04_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 22164 bytes
SHA-256: cd5b30dde77451f79944c4c953f773b8e149061c0921539bd80ef03633fa8928

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