Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4ef3951d11ef72…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 16:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c363e681e8ae7e156541ee1401269ed3 SHA-1: 3c6b4ebafe2bd3c1b2772c3c43f11f39caa34f89 SHA-256: 8f4ef3951d11ef72b90af814c5af52b46a3d8bef24bbac957643871e4e6727fc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves as a lure to download 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 http://hitecds.com/userfiles/file/fuvuwisifurumirofazudoli.pdf In PDF document text
    • http://ropesadventure.com/d/files/39036134989.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/60810712954.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/52839867880.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01713db43---42985162671.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613394e4449ef---57362198718.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd43872022---69166034830.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/pagusemobuzemosazabumu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/suxaxemedivogafewerebul.pdfIn PDF document text
    • http://stromzeleny.cz/file/55946741265.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/11071858261314bf854613.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c38371e46484baf25466b5ccfd0521eb/4439166107.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/sidovikawevinisabewenew.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631487201.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/17799407550.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///18376940624.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19944389830.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/52348026122.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed027ed2fd---jufuriwusumibiv.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c12c907838e539e1d41b0f50f0eadf1/polomiluxajaxazaxekesutug.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/sizuk.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/43236986683.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/95540069147.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/kabodapelebaweluzajo.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/35567770642.pdfIn PDF document text
    • https://timminsrenovations.ca/file/a4qZAElD7Hcpj7RL.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=candy+crush+saga+mod+apk+unlocked+versionPDF 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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 17692 bytes
SHA-256: 0ea097f14a0a5883e6770b44ecb8c409985487bbe15046045c883ef0533bd5fc
font_01_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 11264 bytes
SHA-256: e70bbfb4e3d4b397064aa02feb4a004698178b3fa34e37c890d2ca7b9e6e7794
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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