Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2675c96395e62e4…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 11:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b1371a9d2c5453ad792e857ddb41eb0 SHA-1: 8bd55d8b2462067ece799e68df9c8446a90dc858 SHA-256: a2675c96395e62e4263cfee5b47d974a3fe822590535a6aec43a2249e1a29623
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of external URIs and link farm heuristics indicates a primary function of redirecting users, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hysansam.com/fckeditor/userfiles/image/nazifolawizelusu.pdf In PDF document text
    • http://cheapmarkt.com/userfiles/file/belebujizigojebopipuzor.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/nasosidigawuvapuzexujeg.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/78547196752.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ebcfd12eb8d6f3b40b8ea22c3dfbea8a/83895766831.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/29295424769.pdfIn PDF document text
    • http://runhouchem.com/upload/files/94312172462.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a2c2rejepcvjgtor8rkmk92ta5/28939907146.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/boxidibusudufonudado.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/tiparure.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/31356836186.pdfIn PDF document text
    • http://ingore.cn/upload/files/lunaveken.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131b25de01ec---64294048559.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/35682772562.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/93344695280.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/20628676185.pdfIn PDF document text
    • http://dasbluemchen.com/86241138284.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/osjn57rrm1g0h8jqnpr086dd2b/ditofexet.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/wizikujono.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cfcf4e14c197d46b8aeb463a7c85bc52/xedulojap.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/fedoxetuwapofawusopu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/58906610924.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/gikozufobidetoxeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+9+mi+accountPDF 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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 10532 bytes
SHA-256: a889d17f4e055306b95b37f0dbe165de171b0fd020c2e39f0b11eb1c53674a81
font_02_sfnt_off0000eb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16668 bytes
SHA-256: 2c6872a919536a61239a5ea4098cc7b91ee3cef5b95289a60cff41791e4350b5

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