Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9429754f9a8df53…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 11:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 959ee6868d1e4ae4ff4898190f4fd228 SHA-1: 61e518d8692a49fff7969a76d8ec059e03d2023b SHA-256: a9429754f9a8df53bcdb3f308f537b37d3d7dbbb6a499a073921cd990e1334b7
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of a link farm and the detection as a phishing trojan strongly indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0f27523dd---77416187830.pdf In PDF document text
    • http://cpk.by/ckfinder/userfiles/files/nosibijesoxozalejepu.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/87061145758.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/winofevalelufoverez.pdfIn PDF document text
    • https://oversaslogistica.it/file/tilatovevuvaxewumep.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/38351598214.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/35440243731.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/91894920126.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210528033548247749eb8fau.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/198214804.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/12fc23b1e630843d88c62aa28127f11e/fitide.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/3394089287.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/63923506334.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/fowibepifaw.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pefufaronidedoruko.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/82261193945.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/53823934344.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/dapedofojinajanemagavejap.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210819_DE073609F516C4AD.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3c0550f39457be3bfb2f383c47edc339/84478789352.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/kuxikab.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/23385064478.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd6f8051d---36716598148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=quaid+e+azam+university+prospectus+2019+pdf+downloadPDF 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_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 18144 bytes
SHA-256: 5733174e12fefa257968c361a1f8bed0573834296b32cb22d27d3ec9e0446903
font_02_sfnt_off00014471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14471 11728 bytes
SHA-256: 110acaf4058676c1b7968d044882c2a3ea8fa56c95757056af52d26a36fe88d9

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