Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d489bc411be6809…

MALICIOUS

PDF

96.8 KB Created: 2021-07-03 04:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 537bdce249839d85fa9eb0fbf6fbb661 SHA-1: 6c951c487a29192d4dc474ddf310a9f72028f2cc SHA-256: 5d489bc411be680946c7c149e701f411da9be3ea966b8f99da0d13ac882fa9a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, which are likely intended to redirect users to malicious content or phishing pages. The structure suggests a link farm designed to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t9esth1dr093d320s10044st56/sapopeviritakekuw.pdf In PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e59fecdce---bemosurutiwoleza.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/xokivoxuneboropumi.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kuguwamegubidazedi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c92cdb0fe247d47e2f28b921b28fe0a8/31603193286.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857639b6641---77496427093.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/03154469ff1fd9d85813dac8df1a4c4c/72193900785.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/91508090859.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f5b92f3---xiwekudolazonopusepowa.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5244aaf---76818911818.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/tatoguxarapojose.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/23iqrngpg233h8qeh22o1dvksr/20299677196.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/25495a55a9a68f9f95abb7a5e65484b4/38576143903.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d1ac09956d5d0901c9fa8a7cd510e3d8/remobapavililug.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/sajezivaderozegijo.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zeforedifeli.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/nusisas.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa11e4e65---foruwuwenem.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dbd370f4c---bimuregijoporotoxipevox.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608252eaa82a9---8952415608.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22dd85c8ab---49798617867.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e33f6e2d3---buxubogotasigaxeduvuragos.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2589b4d759f1f7f183e615a2a33a02b8/dabarevefinizinujeketu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=general+ielts+writing+task+1+samples+band+9PDF 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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 17436 bytes
SHA-256: ede999e82c79f3b244eaa8a31d1b1f33c79f61f5fe27ce5f1a37dcad5821af8b
font_02_sfnt_off00015c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C08 11192 bytes
SHA-256: 2523e0f674a02f6e6ed6674ca24b356a0e94f443284e300ac2a519a0992f3fa0

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