Malicious PDF — malware analysis report

Static analysis result for SHA-256 97948974d14fe0fb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 08:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0ca2e0f1110c7485a439dd721af2e8b SHA-1: 37ff5ad8beb57e16cdebe5f826af289c59e9ff4f SHA-256: 97948974d14fe0fbaa98e1e60eaf80a2079514521c84e849fd3f644f47cd3a69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bakotech.at/uploads/ckeditor/files/sefesuzufadis.pdf In PDF document text
    • http://sambometal.com/dataroom/file/94993065581.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cda0eddbec---51837903247.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/janotuwasexasebamu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/12e760fac078d85970dcffac0c794d4b/lepagijapefizapevubufidag.pdfIn PDF document text
    • http://letdentalab.com/img/files/vomaridabim.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/muvojitifotuxo.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/lesiwonos.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/madepa.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/silapudetesijuxepusew.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/83992570866.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/kuripezodogeji.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/zamuzuxewuwafirijagixom.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/27859864339.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/92191951824.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb34a8b424---38129411015.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/lanukovonuzinedozib.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/35236702551.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/80599402890.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/50436617279.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/e9b25cc6319a4edf253b1ff2b583199a/xovarawokidimuzajam.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16133316b9fd03---93446919670.pdfIn PDF document text
    • https://granitnet.hu/editor_up/mipevakejorida.pdfIn PDF document text
    • https://best-label.com/upload/files/43785809050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fake+gps+go+apk+download+for+pokemon+goPDF 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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10804 bytes
SHA-256: 0257d0f2cd097ec2923b321af76ef0590a5a413d2d5a3b4861ecbea2f62ab3c6
font_02_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 14516 bytes
SHA-256: 3251433a11b91fab2388d97f5a2d1517bb84d18a2081b347fb8457e78976e8c8

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