Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14c28d693bf9155…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 01:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6afe8c91b34d24fd823734177e28734 SHA-1: c7e9c82f2f3a0221637df353a279b5a9131b8de3 SHA-256: f14c28d693bf9155b130d6b5f2b217a95fb14cb81a6975df3885b918c5fe8e4b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggest a campaign distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 72 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=singer+tradition+2250+sewing+machine+manual PDF link annotation
    • http://brmxn.com/userfiles/file/20210529075030_5xtrpu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fovafovudigif.pdfIn PDF document text
    • http://langmypham.com/luutru/files/vibotubexusigimedupos.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sielkn6p7oh5ca9q8mc15donu7/kuvewadamekobugubuwum.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/74468328629.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/timewenujidixas.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/nepadodevakule.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/72347878375.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609061ecc3fc9---61198467208.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/42535105703.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/631b9fac23482fabc6b305367d08fd3d/35261058014.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/5158319475.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/912f94a9c0475df92796ec33c5ee5bb5/rimaledokoxo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bvflraunh731c6pujac7p4gb73/73108284577.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/vukavanovone.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0c411945bce00da5611adddd6bf7231c/77338734689.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/42114292908.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/15460451705.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/gazegugujilekegelupe.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/duwiwiloxitalexobixuxev.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/5372262065.pdfIn PDF document text
    • https://coluer.ir/documents/file/momexakokizavuzi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210705_C4C8C2BE613B37C3.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/epalsh9ma525hm2p2g0fpsduph/mefofopafu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 2160 bytes
SHA-256: 37152d19e110259e1a7542e959dd63b0166cb66739f48510bb38e63d3d1f8b26
font_01_sfnt_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 13968 bytes
SHA-256: e05414ec4765ecee9574770adc1db213673a907b6fc77b52609e25dca5df468d
font_03_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 11456 bytes
SHA-256: 9344792dcd2d7a59a175b0a982a050930a68303b557729c0420b5f0ddff2f555

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