Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c5e776e863e391…

MALICIOUS

PDF

115.1 KB Created: 2021-08-06 19:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f2133ff9dd2ab7e4dbf143d8b692dd2 SHA-1: 595831978a98fc0e4f83c115fa39d723e66fd1eb SHA-256: 59c5e776e863e391e0b10f33a2202b50d0d645d9833366d440931cec5730e11c
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 functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised or disposable. The embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://l-max.ru/userfiles/file/40811394046.pdf In PDF document text
    • http://nprofit.hk/userfiles/tenilevavakewudovivibema.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160738e029345d---gipejorefunuz.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/moxozol.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/23imiatlj93f1k5lk6aup596io/16152012158.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/6563794872.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/nje1p1ue467pbvl760fua45c8i/53293218587.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/40759996257.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20694f1fe5---tixenoxule.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b6e27ec1---22815444864.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/48939683588.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/36612721769.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/51262836108.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gesidonepadakizariluz.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/74485236343.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/dimimujelesudatimetenuk.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e63651114---juwenalora.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/59754629856.pdfIn PDF document text
    • http://www.moyekolodin.com/files/linik.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160725ee9b07b8---58513485872.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/durudipuri.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/pokugolelerasun.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c67f900c9---56070301376.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6e8c4b81de3cd080b6a162c85767ca1e/xikasepadarevixok.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608abff1687eb---wilokumuziraleb.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1283ed15d8---lubatodapug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+teach+communication+skillsPDF 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_off00015f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F04 10664 bytes
SHA-256: 0923235cb0d92afca173ac76ec8bd7376fc1a8c5007ed6232e04655691f7f52a
font_01_sfnt_off00017742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17742 17776 bytes
SHA-256: cb1fdcf112a0da53681b2f9eae81004f4625d34452e65bdd58513cd185620b97
font_02_sfnt_off0001a5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1