Malicious PDF — malware analysis report

Static analysis result for SHA-256 f405161fb05ce6de…

MALICIOUS

PDF

116.7 KB Created: 2021-07-24 03:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5f00e509d7f190c9327486f0c9f7da7 SHA-1: e2476affa59ffa1e6d871c133ec4061be7a89113 SHA-256: f405161fb05ce6dec294716ff6478852c72f75c6418911c4acef9083245c09fd
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URIs pointing to various websites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of raw IP addresses in some URIs further supports this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ttlh.vn/storage/ckfinder/files/5941377787.pdf In PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/kanotinun.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd040b7e41---fivofojuj.pdfPDF link annotation
    • http://annamsaigonlaw.com/upload/files/rategilagidekagu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b2269205---lugaxedulupir.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/pusedogivedutip.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/luwuv.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80614358650.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/b422a4293406fa51c6806150fdd82faa/9726021294.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qsuqbkfjfpaefr948tt2m6l9f2/34405825163.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73960941854.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/zejabosisabavatowejafanu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070609202b5e---fapoforizulomopovigonokut.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16072628631bae---13127100460.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d204080fc3---64536796698.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/18390736955.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/80828259621.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f134100aa6---moxodadepiw.pdfIn PDF document text
    • http://iltorg.ru/upload/file/pekazamanexogofowa.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/24257263391.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebd573392---nanufarodalufuj.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0ccf2cb5---4110680613.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608292c782978---31068731481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=graduation+party+program+examplePDF 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_off000161e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E8 10924 bytes
SHA-256: b9e7f52f9e90f6b7fede4385ab1e35ba15e5aa3513c32c8b8d13c53cddb0f92b
font_01_sfnt_off00017afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AFC 18288 bytes
SHA-256: de87131dc081ddeaa3542ab0a78a7ebbd0a29a5d5ac1a93a44de7438a024c3a3
font_02_sfnt_off0001ab79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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