Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a6a465212eae4c…

MALICIOUS

PDF

98.3 KB Created: 2021-06-28 23:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39704d276024ed92242609fb2cd12fab SHA-1: def0677e99fa4a65d193d77005967ea686efb482 SHA-256: 97a6a465212eae4c013856ee31befcf7c806922d2d2cd8e5fde27f0c7fb7d4b1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware or phish users. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d544e1cf3---dakonobosid.pdf
    • https://bodymart.in/ckfinder/userfiles/files/93815019085.pdf
    • http://www.contectrade.hu/fckfiles/file/20840168863.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/86f5bd94e2967f67844ff666530d47ff/75173507477.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6ac904176487723bd205128af1b0afc/23339334246.pdf
    • https://bselink.com/userfiles/file/71566439205.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045fcd7cd1---nisarufosafopid.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/d2ebbc47eceda17154e2f748cbe8d60f/59117080287.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38998f7d---xotonetunidajaferaxov.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8e6ee15179a9555b6f6579e14fed0ccd/56375044849.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430000011711953.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/7b62da8bb28dcf711235c5df4ee364af/47410159096.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/brtr949rqduq5vr9qjrol1833i/dofirojedoraza.pdf
    • http://buergerforum-tirol.at/file/12948713294.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/fevulunarufezude.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/4332675147.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0esoaoa4mmfoes08r4mjgflec1/dunojitasigujedifirekese.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/988386982e9a8b537036901e4e6fc65e/16289144383.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aff6d7410---rebuvigubowusoji.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/781ab10f5361974925eb59dce7c8637f/57596103725.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1dd9c7aac---beviriko.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607974a271377---zetaxipinamadememutobew.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086145da8b65---53198451887.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7adbfe08a1dc8721a638d7c6a746c63e/xenedepibivopobu.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087da723b014---wasifasezotuxagezibikela.pdf
    • http://laweasy.kr/userfiles/file/masipoduwejevatokomase.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+parrot+bay+proxy
    • 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_off000111cb.bin
5de0bf5025818ef70d2a3e29b5fd44f1bd794ff7da2781e338abfaef24c0c97d
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 29136 bytes
font_01_sfnt_off00014b1b.bin
aa7a2c87f5c90afb0958616b38316a4e83067367147ee515cc34b0f01c117e29
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1B 10256 bytes
font_02_sfnt_off0001621e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1621E 16792 bytes