Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ac71df1a252ff1…

MALICIOUS

PDF

90.1 KB Created: 2021-08-02 23:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc283d008158eedaa108cc193a937c92 SHA-1: 1249a09bc6b1e6ae4bfb95611d2caf5b94317e19 SHA-256: f8ac71df1a252ff1d43c250fa3d7c42973598f5ff22e57adcb28f9e5809ed17b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The document's structure and embedded links suggest an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9406b706---zital.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f21923cf1a1dd7de97b95703d6c251a3/nulivijir.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/rixuzom.pdfIn PDF document text
    • https://fasaac.org/temp//files/95643238052.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/61655414440.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb784081f---viwowol.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/vozisexavaki.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pvgg9oqiu5p4l7q0qarqvuvppb/bezawupaxoweg.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/83527043898.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210615150409062196staalg.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6cc9a38a---37038216894.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mrn8ghn620uvl9jbdva1ro0n4c/14892896765.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160882f89b42aa---ralanimikekederinawetosu.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/67501149265.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16073702e0d21e---mulajeri.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rbomegu5q9mktn3fatu8e5lhte/vatewuledikanikugusinig.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5e01a4fb---18201038076.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/duxiki.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e93ea811392f5b1eee142b9b31803b0c/suberepipigunafedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nad+2600a+power+amplifier+specificationsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 11252 bytes
SHA-256: dadeaf2f5f75b0a1210de45b6312059a59436e29c91f3c5ce2b3d6216ac3ab01
font_03_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 18176 bytes
SHA-256: 49c29c8dde84634a735bffa3984a8deb8b30e17e6f057bf4bd8ba378054b3671

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