Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ca01dc90c37141…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 12:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2774e65fe6547ee9aa0a9d6a29f6b2f SHA-1: 1bcdf120bbdb689d902d42dde454370a0e1f54af SHA-256: a7ca01dc90c37141e2e78060ea6988e3df069ee6da5214eb0122e2355ef3866e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://pixomot.ru/uplcv?utm_term=nikon+d7100+manual+mode+tutorial PDF link annotation
    • http://tatvideo.ru/ckfinder/userfiles/files/21367711432.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/semofarekexe.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff7dc9bb2ed---81394504526.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d47bc37c67---93729453782.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/xabifarizokenelupaniz.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/judufomikilofiwataxilute.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083d17cbd94a---62952925319.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/80718533952.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/55bfd65210e730648089bcf6f776a0ab/3832663381.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/81743960023.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/40476199868.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/vuvos.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/48741976275.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f410c3b8a0---95494600376.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/vudegi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a92f4365b78e43a9566cb58c08f849ed/44910328269.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5eaf0944f---88489559853.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/aveus1i267mn0b27vjltq27k03/sotafivov.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/63282980268.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/12486284341.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a772969fbd7---vagisudujofasifavakege.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7aff4f6859505abeaebce4f6263a353e/dezuvu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/29857036108.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10636 bytes
SHA-256: b9146e660d2072438c016d8096ceeed0a6e3beca49bd4db14edbb6f36a237df4
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17960 bytes
SHA-256: d475af60398845af93d5f3ecbec4dab175076847a642d4baf157e4a53ebd90e1
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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