Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d892d4f689b81b…

MALICIOUS

PDF

86.7 KB Created: 2021-09-04 06:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ceca01facb0326dca7fe58548322afa4 SHA-1: 56d76cea11816affd8966c0dd39fe4ff9241cc42 SHA-256: 57d892d4f689b81b0964920fe02269a04c32b3235aee164be8551d18a6dc0413
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. The PDF structure and link farm characteristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://oniceh.ru/uplcv?utm_term=phonetics+pdf+in+telugu PDF link annotation
    • http://debandhelder.nl/ckfinder/userfiles/files/2637989977.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/xenevijoforokapubamemi.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/46306069009.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c70171ceb57ecf6b0364a4770714c071/jinibolujaxakorog.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/214dfb5aa6c2745c87b14db338511291/52625047251.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b94dea4ef5a---95982458073.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/bebuvewatadimosidajefilam.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/dagozubebaravijofebavi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/fojudikebulemopavu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a39eb6596f0d26f3dbddc1d3391a534f/fuxexosujubuxiditoso.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fa3fc5b620b37f67486f88f28e8721c/62621952679.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160894673440b3---piraluke.pdfIn PDF document text
    • https://avflash.nl/upload/files/podigurokaf.pdfIn PDF document text
    • http://hongdacable.com/d/files/puwivefivirok.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/cvu1b4bipghd4lko06jklki3lo/52151602801.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/23006996587.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/eb68eb0c739911cc72bbe882d51ab7b9/jelowasosuzojudomamoxenog.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/377d5cb9e216ffbb7996ba0ecff61886/21495248967.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa2abb660b---defoguxojejifunexidanabex.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610999e684c74---76443885211.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/40315819676.pdfIn PDF document text
    • https://denimder.org/resimler/files/32796417439.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gizoji.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/54942139229.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/lipegukavegunajem.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa74d0ce2---gikazabinebibidu.pdfIn PDF document text
    • 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_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10736 bytes
SHA-256: 328e23d4f7f058d7fb4a38dafd80c671310c301c971880ce9cb46b0843ddbab6
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 21820 bytes
SHA-256: f6097b214eaa2e3948213b83863021bf10fa37d5850e1921a551ce54f0603e38
font_02_sfnt_off00013583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.