Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a6c8efe4d7beda…

MALICIOUS

PDF

103.4 KB Created: 2021-08-04 01:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6d9bcb3eb952f9adeb7382899b1de7f SHA-1: 70842384736f2203b8d2b6ad872b1e5acc432986 SHA-256: 17a6c8efe4d7beda5cf93fb02a33d176f588651038222b3271ae314889bcd76f
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users into phishing scams or download further malware. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://ketchas.ru/uplcv?utm_term=el+coran+pdf+gratis PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2c64afd3a5e238ca0d70ebdfec28d626/75558558346.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jasowetabetolam.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/96892066322.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/vemajarutinudiwivaname.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608469a9568d1---wobozuvakax.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894b7f9528c---gipedu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5bbd1afd93d3537d6deb69cdad7aafbf/pegikisipixodugufosibevud.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16102b17c74179---sovijujijita.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7fa7bce48883e1541038bec9572a4b4a/13287141078.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/webulipigimoxe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70c49980e---mevapileladurajetite.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/eb6c3c6f65c0ad86c2347ee905d4824c/22948688826.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/durikafif.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bde8de5c8---85264567624.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/32620881898.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/85059572771.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c835d33471f153a21c075e5542d27dee/35687730972.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a8ceeadbd---3061441676.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/48704148184.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9tsrmtcss4b1dnpuj6kqt7q8q2/72559351407.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160822e3dd3993---68778937194.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/76614489462.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65446059741.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e38116b93d04f42a98082dee86e8ffe2/resuwutopifonojob.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off0001684c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1684C 21316 bytes
SHA-256: 600ed3419109ac3b03dd3a63127a6a2602881ec36c448a2ff2b82d6e66de4869
font_00_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 21768 bytes
SHA-256: 0e6c4b9372941ea20cc022d0abd2fec2dff1e6294a84858ba87b690c5938d85c
font_01_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10648 bytes
SHA-256: e1cd36da4ac681ef9b56fd45e2d58dc943ee3ca8a9405a726010c29b4cd6c1e8
font_02_sfnt_off000146f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F7 2028 bytes
SHA-256: 81caffbde2844fb3d6322673c455ccdeee243c0ccc9d2edd8ac03903b17d606c
font_03_sfnt_off0001503b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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