Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37e5ac55b0a8e88…

MALICIOUS

PDF

77.6 KB Created: 2021-05-02 14:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c82cde9c6063a9ac6c889059305647a SHA-1: 3c39b7106db5b8353ca3f0c7ea80acae72283b97 SHA-256: a37e5ac55b0a8e8899be5be27f0d822682bf9dbb9107efaac29c2c4afe040e7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608862ce7b58c---32141370624.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0100e46f6affeff61f460737845e0605/golojidabezumukutetakome.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c78b74ebe---47822842969.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a7a68fac---28482591497.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb66082ef---dixudubiketexir.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5f535655c1215e9faeface1767e21297/godir.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0d8b53a6---62215265484.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16074081945a02---30369916655.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889077db043---getovavizekotuvanivu.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607665e941b5c---35241261463.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e9d2099414aeaab7d2ab9c2cac46c69d/51117059989.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea85c834a---xuwutakirosazobaj.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v7sbopnfdjvcfc0ur385jfhfvr/kanubin.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f00cc3bb8---67178322686.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce864ead07---rajirawuja.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608161556cafc---73696021843.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f771d16a5---zabigeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=asthma+guidelines+2018+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin
413e061f7e28ba5901c6c1ae8eed560bf93b8e603c040efeb0d57c306e3604ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5640 bytes
font_01_sfnt_off0000fe94.bin
17d49e35bd6919af3a637a50266d355df7f93b39491125fc470256163740fdf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 10348 bytes
font_02_sfnt_off000121fe.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 4324 bytes