Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9943affb533f1a6…

MALICIOUS

PDF

102.3 KB Created: 2021-07-31 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b3a973da4d6118187dd9bf50655d050 SHA-1: 37e39b7646502213f9e236b0463ab1c6a7ceb90a SHA-256: a9943affb533f1a6f6d4e0bea501f9a1cd7dd742efc004288b5f4bceb7743f34
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this, likely serving as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2464e8516b10e31d94a34ee03ee5ee70/gutajeraxisokilebaf.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/0250a3f6e9bd02db3f8bc330ae9708dd/49862327361.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9b39f5bce76679292c2193c984670822/xusulijazozuvimo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc049987c7---79868052071.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ttr8670oofngnbu44pktvho1cd/53369413144.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/ladazuk.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160842a970f444---26132121361.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kabunirisukaro.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/403f9c3e4fb745cf309f344029776088/zusejosokugubi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4f0bc863a7ba4aa823fd23a9daa30b5d/95672171224.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5264e0c85a---66068140523.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/dulubekobepowigolam.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb756fd1f---51227690224.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fukuwafegevam.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6df158be---13130375746.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29ab433c6---rimonedafipiduf.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/19987935768.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/70277398050.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/53048357459.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b090c89ac175bedf173d1f723560015b/27154105572.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pudewaxorewafok.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b172c2ab8---8543762112.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dai5j8quufhjn1mk7ljsft5772/19326062251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+misfit+of+demon+king+academy+episode+2+eng+sub+facebookPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 23800 bytes
SHA-256: 1801703ce410b406129a4bf688febc272f941a60d30db901ced660e55518c4bd
font_01_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 11452 bytes
SHA-256: 94d8d3ad4e2970b66e82c9384884fed68acbbb737e392b050add05b9cadb20bd
font_02_sfnt_off00014c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C80 16208 bytes
SHA-256: 4602efdc27effd6d0b9796dd62a14020f6514d216ceac1da6ee579af8a0da4e5
font_03_sfnt_off00016245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A52 3900 bytes
SHA-256: 8bfaf02047c25921c5c0e4af01d2803493128595720786a6b6b7a9102e72fb02

Open this report in the interactive analyzer, or submit your own file for analysis.