Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c352c50f33009c…

MALICIOUS

PDF

98.3 KB Created: 2021-06-26 07:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7216a42aded40f292c22ba0b7e83680 SHA-1: ed86013f557a32e09592ebb16edd2960fdff3489 SHA-256: a8c352c50f33009c31eba5eea0a8e8bcc4c077e4b288e6f7f273f7c596f2fb5e
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 identifying it as Pdf.Phishing.Trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://infrive.ru/uplcv?utm_term=derivation+of+equation+of+continuity+in+electromagnetism PDF link annotation
    • http://onlinemidias.com/ckfinder/userfiles/files/tatijexabuluzatef.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b46e9c5---sozusuripodokonibujixuka.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/561a462a43fbf7fa7578403999a309c3/80778505008.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/2e8a0c8ca99711fb6e02665993b379be/98287723218.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e9d3d6887828d844023d0cb30acf7952/89576245544.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tg96kopj0ojh7fko3gb9j9507a/906358157.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1d0f2ac4---xuwivaxomuzu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/91pdsnbtdvebun809ctk24plmv/36256939528.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/25738266019.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/rc7narhdcjiub6j2c9fin3411k/10032802104.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/mozerogu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/rm5hq2ps6cdojrkgrn4lrbkne3/75524210867.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/31345364886.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4bcf16b550dc17fab559b0b9f078d1b9/41340080616.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/sapelafutapawu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/11b9370508943ece1e55d120bcf163b0/vagisuzisegutimodakeleve.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjok92f8si7u5laj2l1nkmu5h/bupareforubug.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8a99c756393eba50e2bf9a29434b4230/81055004763.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/86698439048.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b3ac344de81cd29bb2175f48c5e1e282/50079125307.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608091701786a---91693557117.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/72264727297.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/s596uip1mp2rf6nvq1m563a27n/sebofukatinufuregigabopos.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30147885070.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/883a5c15d19d9c1df076cb5b83ab95b6/dapuzetageludu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f757.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF757 22516 bytes
SHA-256: bd5b26e6a0969c48a078868b0e7ab3f04d1269f4a806e80d4fcb9abca34bbd3a
font_01_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B38 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
font_03_sfnt_off00016125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16125 11108 bytes
SHA-256: 5d4a43cb9a10b3aa81057205478c7d5186bc49688a75034c0e63b8b8361a93e4

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