Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a5f780aebc36d7…

MALICIOUS

PDF

85.2 KB Created: 2021-07-14 03:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2c29c59d1616529b39a14ae08510615 SHA-1: 7124b305399cd7eaf3b2d4038d5c251c320e7c0f SHA-256: f4a5f780aebc36d7776e9dfc41b0c8b8c4f3c09cd78d5f7267c18d3a3e3c5eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://krisoc.ru/uplcv?utm_term=some+basic+concepts+of+chemistry+class+11+pdf
    • https://boucherienabli.com/uploads/FCK_files/file/65143196917.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a175f661ff7---5624821872.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e8c459fc---69421452779.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/2f92ba25bcc2c94a4b50a360a38a61cc/41676077001.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v040054g5cqunnmk75d47c3mt7/55755983920.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2b8d6cac2ce5a4bfdf11e6cf1b310fc3/buvimifakalogezamo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d57f6657d---99471957389.pdf
    • http://sewakendragroup.com/userfiles/file/30685031689.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bcd0cff05f21e5ffff0d0254bd9552e4/bulamiludesuwajum.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/275e0cc024265e2aa396dc3261a4eb4c/zotixubevuja.pdf
    • http://brmxn.com/userfiles/file/20210530135823_gni1w3.pdf
    • http://brixtontaxi.com/survey/userfiles/files/19770229630.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a983dd8b722---mimiwefewulez.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4973107f2---47587788542.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfc0fbb269---75378372995.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a482c5e8a7f---xedevavabosolixifutos.pdf
    • http://woorymart.com/userData/board/file/nedurulewonawetumutamifa.pdf
    • http://fedoro.ru/upload/file/zimuxosu.pdf
    • http://afgventuregroup.com/cfiles/file/fosomuwirosi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c4bf32f88---rafekux.pdf
    • http://novussiteyonetimi.com/uploads/file/81317867131.pdf
    • http://immobiliareborghi.com/userfiles/files/butesoruletenolanututulix.pdf
    • http://herfon-machinery.com/images/ckfinder/files/20210713041420.pdf
    • http://thunderstar.cn/userfiles/file/20210622165622669125636.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609559ef693ac---fubesakowixujaxajive.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088599813f88---ladanurawiwutolugukez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e816.bin
3644f5be942c6885f35e65a1aedf0ac07cf615ab67b5bff5e8b64e93494205c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16576 bytes
font_01_sfnt_off00011300.bin
6c80ed610ea34405b3713f58690799a43d1df1dcb4c5244a8de16c1a0c20c6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 11264 bytes
font_02_sfnt_off00012d14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes

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