Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9827c878043cc5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 03:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c6e0085fdda7c616cbc58fc503a2786 SHA-1: 3da926bd8e09ee870684cd65b219724c43b6e8bd SHA-256: af9827c878043cc5fbba22bac82e834cb0c88d7361c49183fe12aead16c15050
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=odibet+app+download+free+download+free PDF link annotation
    • http://k12kos.com/ckfinder/userfiles/files/24219323177.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/ludefu.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/83103417345.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/nulogirasadarukimib.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/77594592340.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pebakokexupef.pdfIn PDF document text
    • http://rongqichem.com/upload/files/wafogetut.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/12234065951.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mezerumutizoz.pdfIn PDF document text
    • https://ever-progress.com/upload/files/lazalajirufawoturi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/36694783954.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ae3672c3---44541700262.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/jinof.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5f5b5c6b63fb5efe386d738998ba02bf/94194181286.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/7126769610.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/65323767493.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jenes.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/14089370975.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tiwukogewanexazadekewevig.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/levovopatitaxefewimute.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/rijimofujumixefel.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/915dfe2c968b3f94b0f992257cb9b1f8/98385101106.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/tuzanowevoledizuredu.pdfIn PDF document text
    • http://rinsacars.com/files/others/zavemegumajape.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10576 bytes
SHA-256: c68a57a1b75fbb14012d93d90c5d07afeebfd089a0c687c0d0d91e234e03429c
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F92 17448 bytes
SHA-256: 3f4bd1dd10d672e879d584f966662bf6b539b06c9f8640af93254bf402749177

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