Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abc27931a003844…

MALICIOUS

PDF

122.4 KB Created: 2021-08-09 07:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8f029724258ad069b4e66ecdb0cf092 SHA-1: 48eb9694d9c99d32cd34128d1a526f7ce654a666 SHA-256: 1abc27931a003844bd7a9b37f453fea389b6b92fa453f0ea49057f52a81419a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links, likely as a precursor to malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://savoie-outils-coupants.com/ckfinder/userfiles/files/zoperekelipago.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m59v303kagn0r34uet5n8s24a0/kuwajisilejodutivirot.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021043012124173499.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/24390546077.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/51919230168.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210808134806.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kisakewapejubad.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2937ee74a3---waleba.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/fimadumirisepigi.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/serenozo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080366325f9c---vonipufakovolap.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/bababo.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/vutagozas.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/95664302149.pdfIn PDF document text
    • http://africareview.in/userfiles/file/dimonukokadusulekuf.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f672f507494---9170026110.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/jatusepetatedaxu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/47796717425.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b67cb1eec---zufalotusudejokegi.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/regugaranuwideduxorukide.pdfIn PDF document text
    • https://argumentua.com/i/file/vudikuxo.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/60557750756.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080079683a61---jutijamatosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=figurative+language+worksheet+for+third+gradersPDF 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_off0001779c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1779C 18960 bytes
SHA-256: ace90637b24c149bfe2df455a89f73bee2aecce8fc134603af5000cb71f1ded4
font_01_sfnt_off0001a9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9BC 10956 bytes
SHA-256: 098781f2c14399003d7843eeac20752a36f3af3b4672d34a16b95d6e8d670d19
font_02_sfnt_off0001c2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1