Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5fd4ca09c95ddc…

MALICIOUS

PDF

93.9 KB Created: 2021-08-04 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39b06c5ccf88576708b32b3520cf1331 SHA-1: 463c9ec6ebb3e726d3ab0f0885a73e9960de0ad8 SHA-256: 7e5fd4ca09c95ddcd702daa6bda603760cb5bfd52ae33186514e724af9d74f48
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to leverage search engine optimization for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://aydinservis.com/ckfinder/userfiles/files/jowibotaladowug.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8dffa0f1c---sepogugab.pdfIn PDF document text
    • http://ibb-online.ru/f/file/xevuvelixudu.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6ccf5ee8f68b54996515151a4f67875e/dasetagosigotimosut.pdfIn PDF document text
    • http://bociany.sk/media/file/jeboxitid.pdfIn PDF document text
    • https://ferropula.hr/files/46317483733.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/7422967096.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608242efafff4---juzesemefu.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/37904312056.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47d8b9c2c6---87513693633.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/50549080343.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b007a02d044---xoxavidenupebofe.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/69382141966.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707efdd5c42---vokikotu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/getijeduxudodigip.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fiziruvolepopo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47a14419a8---92989293674.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/46897582121.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f43e75782---32827774343.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b611429c791---nibavaniwazakorokuzari.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/selavisosulevigozepune.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/40384675038.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/67486702278.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1c66f96d---27605217206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+much+is+a+finder%27s+fee+in+real+estatePDF 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_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10952 bytes
SHA-256: ec8b0cbd728ac1063f4668069234c43c3b7538d27e3d784e03d2ac969743793d
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380C 17804 bytes
SHA-256: dd9a16c57bc6049796a09a5fb7a28d6a97420beb8ea35091fbd8b2331f583a94

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