Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3a2721c002fcb5…

MALICIOUS

PDF

89.8 KB Created: 2021-07-01 17:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 078c6c6b1898bb614127e62182b26664 SHA-1: 363117e36eb536575df2494585699a9e26d8a8e3 SHA-256: 8e3a2721c002fcb59dbd433027b94c1b37b450af7f168f8f295d6ccad9c1bad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to distribute further malware or conduct phishing attacks. The presence of external URIs and link farm heuristics strongly suggests a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://catamma.ru/uplcv?utm_term=how+many+rectangular+faces+does+a+rectangular+prism+have
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772099d4d75---27751434649.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988ca6b3f56---6660439298.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/06fb40f8992bdcc0b89270129c011d81/berosokadeluze.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/1b658c201790d85c980db0ccdbed684d/denolixiwu.pdf
    • https://la-klamm.org/Files/files/76662454567.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/99da14e1c2bb76645939915a861d42e5/75680603958.pdf
    • http://animalscipublisher.com/files/upfiles/file/24565803751.pdf
    • http://dianacb.cz/userfiles/file/soxiseruvidositapidifok.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bc7f73b9fbb57fadb59b610bbaaf7329/fopunifexifebobe.pdf
    • http://omonetach.pl/foto/ilustracje/file/65461789187.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791fb1a26e1---24208607275.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39dc47145d366f978279a114d6a092ba/zisafitezojafunixenap.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad1e45483---wirupuzemo.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0f3b9a7473a4e18d0adcdb16f3c90846/92174419153.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/62bea091912d699b5a1295d292f8432e/30846287843.pdf
    • http://ahlhy.com/uploads/file/282346238033.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gp5u8p5740k1dsgitlsih5h2c9/wegebekebawoxo.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb5f744ce---jegamukopebebopawoxirare.pdf
    • https://ka-base.no/images_content/file/99959639758.pdf
    • https://aquatrustfina.com/userfiles/file/38422145260.pdf
    • https://floridainvestment.cz/files/file/puxunaxedipatuduxi.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e3a835e57c1013264246169b09628083/65036607678.pdf
    • https://luyenthitoeic.info/userfiles/file/topabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1f.bin
147f4b94851c8d4a854e395ba589a1f70cc58f2bfd78324cc509f0d5a51b7e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 18672 bytes
font_01_sfnt_off000110a6.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 16252 bytes
font_02_sfnt_off00012687.bin
803efb2b149e5c8301eb9c05403f03efa35fb0512b80f01d29ce2ac3f0e92bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 11424 bytes
font_03_sfnt_off00014120.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 16792 bytes

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