Malicious PDF — malware analysis report

Static analysis result for SHA-256 903fb0906387176e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 03:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fce1d04233b19098113f466b6f06a3e3 SHA-1: bcf69be7343771e0998b2bbae14813c30b47aa43 SHA-256: 903fb0906387176e5b9a13504213d62eb93ca47263bbe2a44916101b397d7f92
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains embedded JavaScript and a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=xbox+mod+apk+download PDF link annotation
    • http://seidels-mineralienwelt.de/images/uploaded/file/38388498013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428852c546c---39545852336.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/gimuvapagubosiso.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/nenametasujojadoduwu.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/8f2c453b02918c5245ce0b330b6fa9dc.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87723140242.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/loxokufogi.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/35937945400.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/4963906326.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/31864528793.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/pijituxufuvivixapatowuki.pdfIn PDF document text
    • http://vipdiler.ru/files/file/namab.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pehsc8etug47q73o85kt06pj9a/milag.pdfIn PDF document text
    • http://riviera.az/userfiles/file/roronedewug.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/mejozekujusana.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/jujotopikosazonuz.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/xidijululixosuzajubad.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6fac1ac5ed24f58f775cb42f7822ff65/82023696059.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/93573505124.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109122305132682.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/janufafanugozitizasol.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93bd0871d---wuropofow.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/83307648940.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/lerewevidojajafemev.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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10392 bytes
SHA-256: 1571793ffc9a7180be9f34e31e9bdc8d94e05ad60c21ef3758ddfd844503b503
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 17312 bytes
SHA-256: c2963603dc2c4c59360fa8b1fc07a8c35a541837dd5202db6935ad257eea1198

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