Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebf9ddea26804bf…

MALICIOUS

PDF

88.3 KB Created: 2021-08-16 07:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4174629e0cf8c10f53d74f3220d5e946 SHA-1: d926bd3c23436a03a0a7d3c9bcb1b3a83216bbb4 SHA-256: 5ebf9ddea26804bfd7452b58e20c6aa58d4ced3ca47b76ec0c1fdd3e0ce92f8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The high-severity heuristic 'PDF_RANDOM_URL_LINK' and the ML classifier's strong positive prediction indicate malicious intent. The presence of external URIs and link farms suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further malware, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/rgj8n68ur8f1i1qkabvcn7gkr7/simoleroreduxusuniz.pdf In PDF document text
    • http://ge-mak.com/files/lotofarabobidigufuxaxe.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610efe8c66e5f---sefamegopitasibonugigilu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161107d0532c48---95762100570.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gebasebukitawekerumivetev.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/relazotifuleva.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0203b231b915b9eb252799ee8ad65076/viruratawujobobititirur.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/39695053484.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sarod.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b64080bc---81745043761.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f17ddc754a5b5093150b6ca7e182ca59/jerorixida.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/baditozogeki.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6192beded30c947de6a98487de048191/42325682448.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/59659360282.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624956958.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/noteledupewej.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/57838406635.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/xoxudiwojuzaxok.pdfIn PDF document text
    • http://kotolantopeni.cz/file/rikopapozinatuwufaxigipa.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/92751888213.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/0d6bb20040511d44dbff1c66742305a2/wivebusugixotovesokaxax.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c46c3c54fcc3e2657ecf108aa4e8f23c/siduno.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/k1t5qto053avdj1k61q72t1jg4/mukadabit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=office+leave+letter+format+in+englishPDF 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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 17588 bytes
SHA-256: b87721522d53ec81bfc6af6c8650443526e773fe67f7116c10f157fe9d735a64
font_01_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10876 bytes
SHA-256: 2a53d72fb2962614ec7b251badd49a97c4ad534d8f5be16a6810a7531ce29d3a
font_02_sfnt_off00013a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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