Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1973f9fa9e71b83…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 09:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089c2cd0657bbd12230023ec204ed5cc SHA-1: 0adc33ba6b467baa87bfcd19309317044cb7bf21 SHA-256: c1973f9fa9e71b83baadc3036a32a4a8e128b9b92906a77ae2f94159bdaddece
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jr-bang.com/uploadfiles/20210617121018.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a617e17bffbafb121d2701bf0bb9bf1f/26948501622.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/gilasasidalupeva.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee55cb4c41---pinutojugalufepegiremek.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe50d30576---88727687920.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/lekadivubenatixugiw.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf9d62d32---xarowotiripimade.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/0e0ce94c6d39a460d5fa1df1046f4bef/36441805474.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900a1fd26---17048244591.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ccdd2c01f46c111ee405191cab378017/fesasefufuwumaweluwexezuk.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7a41bd40---10259743507.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef8e4963a---gejabuxefema.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810457138c3---59574380346.pdf
    • http://119hero.kr/userData/board/file/rotufirit.pdf
    • http://fitsiluet.cz/data/file/1309687699.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/150839490960bdb26238857.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb04de3e48d---jegidox.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a09d03c7b---jorizumotifunujunuji.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17ecaa408---suvalopukafugixuk.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/92dsdvniisoa36upqra1cfnm4q/3881394867.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0812b05b74---7050837808.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769fec01280---jimeropigutoxatif.pdf
    • http://ahkkpcm.org/userfiles/mevizokekirudomefaribevi.pdf
    • https://michelbarbot.com/upload/files/nemabutakeke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=asteroid+synastry+chart
    • 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_off0000ef06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 16792 bytes
font_01_sfnt_off0001071d.bin
0212c77f12bc74feb0a2166d58c87a282fcf71062a754fa0724587dbc9f18e25
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 10516 bytes
font_02_sfnt_off00011f0b.bin
edd29acd88402a54ce1d3c6881113f3063fe572e1c46dac21adc9b3921bfbeb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 17744 bytes