Malicious PDF — malware analysis report

Static analysis result for SHA-256 836176d7bbda3e74…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 02:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab3a9ab3e348a26c0fb71cdec1b8280b SHA-1: 5865b21f41b7f95b9ee97f4c905609a00927a2c3 SHA-256: 836176d7bbda3e74450a42b51b12f2b72e8f774039971d9eb3b1acb4cb6aa509
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged the sample as malicious. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://omonetach.pl/foto/ilustracje/file/tapaj.pdf In PDF document text
    • http://learningkey.org/userfiles/zujapenovigisixus.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/kozajetozapedarexu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4723cb653169998a04ebc079ca88ad55/41847446988.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/namunuvulamesigurilat.pdfIn PDF document text
    • http://zuche0551.com/upload/file/52654675262.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3330daf4---49893670501.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2babf126---keguzolewarigisaremeg.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/77713343548.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e28fef06b9---53039208220.pdfIn PDF document text
    • http://schokobrunnen.com/idata/sijatuwujiwaradi.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1178033425.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/41872824719.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77908231435.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d3de26ad4454fdded86ecb39e41bc2cb/98855106781.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac657a29c241197ad341e302337ff288/72428574056.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/virimirisujobateduv.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a696f5adc52---wonexon.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/54978293981.pdfIn PDF document text
    • http://iccarrentals.com/files/file/kutotiminulofo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b43725e308b---zofifububelavuromiv.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///pofewasuvibemanipipirun.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2036aba7f---75964248552.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a8b0b2f6---87485840840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dual+momentum+trend+trading+pdfPDF 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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 18192 bytes
SHA-256: 251891b718298f22048d155f271c667c4ee6e494693bbecd7e2a47d757fd9d66
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10772 bytes
SHA-256: ad3cff4684a2484f07dc62a7e28501ee585e6f1512211a948fa28f38153aac78
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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