Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46e00479adab5ae…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 15:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06d47844bdd8b82ca0a1f1362c244aef SHA-1: ec3cdd5eade7b0aee2a8c99d78cd6a4d136f78b1 SHA-256: d46e00479adab5ae2438115008e3205e3b2c048a6e72c7a38917c108d5a4bdde
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent related to URL redirection.

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://3xlove.com/uploadfile/file/4860299191.pdf In PDF document text
    • http://sziazsauto.com/uploads/files/7280157356.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xipodomapenomokasozene.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/48c8fa5aa333a14dee4d2ce7b416e38f/34371557605.pdfIn PDF document text
    • http://chongros.com/userData/board/file/juxemoti.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pimogilonisipazarokad.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/85231660956.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sonopanifiwu.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/vanexesugase.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vugilisorupuvalug.pdfIn PDF document text
    • http://princeverma.in/uploads/files/86990980619.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/wijiro.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/nisuribovoxisemewub.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fowabaw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe42da4b9---jupuxuxe.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/bogolikekutan.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/vimaradevesumewadofovonax.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/sotuvapuluwimi.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sesuxa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bc740127d9cce4d397126996dd0eff96/bigesuwepalufimugiwokefed.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/minimapul.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/sodajilafetagojemopujobi.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pefusetagexu.pdfIn PDF document text
    • http://samtle.net/ckupload/files/73526624249.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30d287104---tajafuvubejasemazojumeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=boot+phone+in+recovery+modePDF 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 17068 bytes
SHA-256: 8c8fd9c9b0cd806e991e1ec3eb4c8d5943e7f349b279e987ba68b24a19a885a2
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 10636 bytes
SHA-256: be297f23e6e6b0504284a6d97e4918abe17f3ff28bf1d6d900e01a04810d2e86
font_02_sfnt_off00012921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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