Malicious PDF — malware analysis report

Static analysis result for SHA-256 c773b874a89af102…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 637a0e6e68a579dc28ab06fc955880a3 SHA-1: 98172c432606f2213a2513e7b126bc9526cfe7df SHA-256: c773b874a89af102a1620cf4501e7a9e4b67ccc5b152a5a63c45466e33de65f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of these links points towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://centreforeffectivecoaching.com/media/file/46050591211.pdf In PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fbea60fe84---rifadibowo.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/4frsuffnvv4idisokrq0gohsc1/nedufosabomujabovolimob.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/41798136591.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/84125524327.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef25fcd575---bosijevaxezemewaru.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/31262951287.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/89334669910.pdfIn PDF document text
    • http://artospace.com/pics/file/63300665223.pdfIn PDF document text
    • https://sealskinz.ru/files/file/vamilubivakiwuxujokulefov.pdfIn PDF document text
    • http://jinyezi.cn/upload/pujarikedomopilomuwo.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/kosamudezafidox.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fc5177d1---21265321085.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/70042002464.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1223c80b78---nenesivaduxut.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/zirokonurosesizivegin.pdfIn PDF document text
    • http://614move.com/clients/4890/File/xagudobafitisogarolebo.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/49775581450.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/muwilezisigomi.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/198480164760a22c43986a0.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781abe68ec6---15552263095.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc81d8ff9c---watusugevesegiposowona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=silent+night+sheet+music+pdf+pianoPDF 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_off0000c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 17100 bytes
SHA-256: d89fe71df819b53dc7027dad68a43fc6f8790d426cdf57e10bbf22fb1e8b2cb5
font_01_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 11140 bytes
SHA-256: d21245be1b4fbb575274caec6ed7c92311cf06622f7735939d6cca3e3edd0196

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