Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d59cd2719acdc6…

MALICIOUS

PDF

97.7 KB Created: 2021-09-06 01:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9b5ecdd33abbd5548d8932f856f15606 SHA-1: 49a1d9a4937241d212e8ab4d262c0f490171d39f SHA-256: e2d59cd2719acdc61b67a962b7e42fb0a79acf93ec7710f7797b1e0f1db9e3d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://usmleworkout.com/files/file/4720351727.pdf In PDF document text
    • https://alshaabcoop.com/userfiles/file/23087132313.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1d1chq6cs379g0q3kcam10c2po/nasapadojonomajib.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/veriseb.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c25260098c65ad4258ceea70656a90af/nipewajefukemafobumalib.pdfIn PDF document text
    • http://bio86.fr/fichiers/44489489679.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/78619000664.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/57091836558.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/72237231058.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/siwana.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/nipawaxigewirofo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770e306701---jibudapuxemadebilofe.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/wajuzazatewibiburapisiz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16105d23fc9edf---zukupilajoka.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/depokezafa.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/katarivuxofixi.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/sudalelifemipe.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0dbd18d16643c9914c9911b1340ea13b/xunuduwogofikaguzix.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/62b120fba898cf3b5b2781e8bd9e89c8/lezonedo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f98efa06---poderoledek.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/segukorikawaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reduce+the+size+of+a+pdf+foxitPDF 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_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 18620 bytes
SHA-256: df5160d6273611651d27150d3c20e38e3673d424a8bd65524374dff079fb2de3
font_02_sfnt_off00015f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F99 10904 bytes
SHA-256: fbfe35286cce6653d982d7e0308dbae5129d008953902313b54b4b7516be242e

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