Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a89a92629fd604…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 13:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c1e9ef10d38af54f3f9df1bc80b07b4 SHA-1: 43e22860e3aaaac7fb94bb49982eb18aa8a0fc59 SHA-256: d6a89a92629fd6042501d0d1bfa4b71ff7d1ad9e187537e237dcba808856e407
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or further malware. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/370b02ec615b073482c7d9698ca8fcde/kuraseniduranirak.pdf In PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/kugojexewevutajirowi.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/zoxonibitekukesenodizepij.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/lamus.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/66710850933.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/109256fadc5061473df70acea444ebd5/nuxuruxozigi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/88hvu1mssfj72dt5r7f7hf3d1t/surinumigizekumo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/90484524182.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe025718e---75873475473.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/fusemoxax.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5ca23a287588de6b4355a96182d978b3/jukimelafotosegemezupude.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/75213072127.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c282378096---48553473971.pdfIn PDF document text
    • http://wirheiraten.de/images/file/mozawivovivusigexot.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/jojixedef.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kimulopagitilometol.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b6c4a990---65472423660.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed55452260b---93023345231.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/zukopu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/jesapoj.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/04f7dfb2d7ab6ac84025b9981f67b5b7/jepudubevini.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a517b9f220---vexirerowitekajizeduzid.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f9f9f02b664e1ee328bfc1d08143b102/jogadefapoxozajabu.pdfIn PDF document text
    • http://safarang.com/basefile/files/wudom.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/jaliloj.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/lewimorigiveduzomunuj.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/kotozujomelivavibida.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3101f8cceb---sakumofanapudevito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gay-lussac+law+worksheet+answersPDF 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_off0000c051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 16668 bytes
SHA-256: 08f46e72a0623cfb49433603be693a8be3a1a88dfca49ebf09ab774c5a50659e
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10700 bytes
SHA-256: 141744a2f7b32b7cf96e61f0cca58dcc11eeae887245ee38a77a8bf4ac245ea2

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