Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9da2b393e15ef9f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 02:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc41fdee4a40e989ff95db9a73c3d187 SHA-1: 44115458f5dc48415ac83fb7a2b5f733f302277c SHA-256: b9da2b393e15ef9f23637109e13cc0415d28f62fe4d4e4763581d2f3aea8e222
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the heuristics suggest the intent is to trick the user into calling a fraudulent number for support or to resolve a fake charge. No scripts were extracted, but the presence of multiple embedded URLs and the nature of the heuristics point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5169c5d5705ccd57a743e969f4ba0542/88600874918.pdf In PDF document text
    • http://gramercygrand.ru/files/file/bebunimojenidixizi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608907459d16a---kawisezawunijizupuge.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/mebafuz.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210815/files/20210815215656.pdfIn PDF document text
    • http://naucseto.cz/storage/leredijiluke.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/budenugalirured.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/84040400251.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd0d9d3b2---sedodilodixivepumitazix.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16123cac82cb52---95772983781.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/71007671393.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/40467522673.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/mofemizifu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/80826465389.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xogezedig.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81b8f84b47b71519f1a8128cfdd26fe0/rabazifepuse.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kidijowejoferovafusu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e07327007e5---53002328690.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/53661fd0a5e1ed59a0ac46cd5da3d4a4/gunupavaladirelu.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/71010973115.pdfIn PDF document text
    • http://cloverdiamond.com/file/39177024489.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/m9okssh6imcrrl0mn17kq8gth6/lelesuniraxemeda.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106701d192b0---45916770204.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd80162298d---gixibazidoboxusenanidedoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sennheiser+wireless+headset+manualPDF 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_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 17924 bytes
SHA-256: 4e9dd3357b45ad1bd185ec8a19df823c03810b0ad8fa0e48ea84a65cc9a7cfb1
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10656 bytes
SHA-256: f486e2f44b26e271a20a9ff781a39578e009d13219606502b875498fa84df84d

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