Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b8421015a23ae0…

MALICIOUS

PDF

124.0 KB Created: 2021-06-26 01:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8aaf4c809eb601bdf1d249eb78a92f0 SHA-1: 77047ae48852ce7c8b911ed4e4d20dbc67b326cb SHA-256: 49b8421015a23ae080681261bc2e2adc2038afbc30f1a5cc0f608dd76aaad40c
176 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://wonikqnc.com/upload/editor/file/1622241831.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/28086df215e15fdb0811826a60ad5d40/86667400213.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/36f3f65fd75975e10c23bd7b71b16c21/59408051782.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/zumuxij.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/ronutukobufebuxovexef.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/20215761597.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb742eca3e---34740926870.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f872f67334eb911bd7657e38b932e5a9/ravuk.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/10096372612.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf2d8cbcd6---46759524159.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23218597807.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/giridakurumudulanifupifus.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/pasetuvasirej.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7484034f0f3ed4077a54b307cd7c80f5/11479443431.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cd1831ef9926023caf7eba8438f2f515/20942474422.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc271d36017a6140baf0f75b034b7f5d/sikunoxowa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d20c7350858fab0ff111e5ec9167ac55/84042953258.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0lgtms7c9b5cv9n4ql1njqngg7/pijenozoxegorame.pdfIn PDF document text
    • http://apcmagon.com/userfiles/mukoxabaximuzoxibumusiba.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd06550a4c---38382300065.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785800c31d1---93689654085.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aa202f91---gevowelo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ac5881867643e91593a56294408b2273/nimarelep.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2b085768---pozubinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=agonist+and+antagonistPDF 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_off00018106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001991d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1991D 10124 bytes
SHA-256: 54bf783efc2584f2daa1b8721724f65675252e0598bb5bda804213f9da79e229
font_02_sfnt_off0001afa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFA2 20192 bytes
SHA-256: 1dd24ab7dfe053f895d4cc8c284d19abd9e4916ee94ec75a015a42f566995955

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