Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca70f3f3a2119c09…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 12:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 28a37f180c93db65255cc253cb6f2307 SHA-1: e380d16781eda45ec431d75b30adef601baf06f1 SHA-256: ca70f3f3a2119c092b548ab07ca884cc42110e71898dfc452e4562769d3831ab
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the URL structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://klpa.net/userData/board/file/sanakuribazipotodi.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa621051c71---sezezenuxobabowola.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/890686a21da773b7e81fecaa44d5c382/silawarugijokegetedijose.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04f1e68ac---38117479459.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/24652594216.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0b96c8c7---jiratozimuf.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/82885303393.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fdc90da5---remikasumirusejadukeziwow.pdfIn PDF document text
    • http://bscartridge.com/pic/19958590429.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3f8ecbdbc---kaxoguxepubinurukovev.pdfIn PDF document text
    • http://abnicum.ru/files/file/69366421423.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/54c7ea4d05570d4c413c4c70f58aa7f3/2019353435.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05823d393f87748d6a2cad0f0a83c4d2/53120560098.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lusenakixosodaladapige.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/61518374371.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/18399013761.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1bc71bffb---sagip.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/zewugalalidijibu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d42c197c616366bb92d3e9332fde2c10/54865545721.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ccf85b3d0871fef5f865b4559069b1a3/popasadonajedakaz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aefc13a24705630df73ed8d3f4a96177/rebomeloxetize.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/zenajelagijevup.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/sazalano.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/bagaxanidamevusulozetuxeg.pdfIn PDF document text
    • http://tion.hu/upload/file/dosak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=megaflo+unvented+cylinder+user+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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 17892 bytes
SHA-256: 0365cd5b90a783bcfb497e60b3226cd12f36feddf98e716effa9336fe1c91c67
font_01_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 11092 bytes
SHA-256: 0cbf5b25adc736ac7c7968700e562b0d88a72a5d38eb1c8810961ec36e2190b9
font_02_sfnt_off0001350e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1