Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1552f2d830d3ae…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 03:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa6686aa70a8460d662a000bfd4912ab SHA-1: 38354637314166a3b2cfb60d67e867b5b82147ab SHA-256: 1e1552f2d830d3ae1786987392ae24692e4149ef1fc9345103e3b2f9c86436ef
156 Risk Score

Malware Insights

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

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, directing users to numerous compromised WordPress sites and other disposable hosting domains. The primary goal appears to be SEO manipulation or hosting phishing content, leveraging external URLs to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://archism.ru/uplcv?utm_term=the+trading+in+the+zone
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfced60c308---dizexikebinaj.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073951131014---96419586262.pdf
    • http://mobydick-band.de/fckdata/file/47361492515.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d14085bc07d783e0ddf3c732af4d23e3/suduzatuwevegawejofepexim.pdf
    • https://vansuloi.com/uploads/userfiles/file/35545338594.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e09b482e7---16797482154.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4d496408---48710455854.pdf
    • http://ampletrekking.com/userfiles/file/gavuviwewazaz.pdf
    • https://luminex.pl/upload/file/kanomazulabuvoz.pdf
    • http://j-club.eu/userfiles/file/59424121614.pdf
    • http://fredericjean.net/oplusco/file/12079244674.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2eb5a0fc4312049f23f5cf7db3abff64/ronawasuzaxepa.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac0cf1301---rerirodosabesefimarutawir.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c40054072f---55622044204.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfbb6e9ac---71594129480.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e5s5dtbl8014n10lnovek02nef/gitowudibutiverobugewobu.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcdea3b409---zemevofogowu.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53553e131---zuseduviw.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b919313ee7c---dafekuruwugasubexo.pdf
    • http://biosite.ru/images/news/file/26763838272.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/niwev.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf99bd5039---zupajixawulobisabovisiza.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/weserugamore.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6df2a1c12ac8413ec13b7e12f27a061a/bimeka.pdf
    • http://accessiblevehicleservices.com/userfiles/file/gugozofanoje.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c60db7edc9f---voratajupivavorojafiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e802.bin
e9feb0077d34c9869c5b6c03e72f3b1efd185ebffa3710e109e8e471a7179b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 17688 bytes
font_01_sfnt_off000116b9.bin
36c00c9ab217c21103158166d9d3e285b92d1445182b8e9dd0ea55fda1ffdfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 10336 bytes
font_02_sfnt_off00012dcd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 16792 bytes

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