Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cc972b349fca8d…

MALICIOUS

PDF

76.3 KB Created: 2021-08-04 09:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d2c3837328f82b2c37fb763e0b098a0 SHA-1: 7938320f9a4febe21298abfe5febc3eabb927708 SHA-256: 77cc972b349fca8de2e793da1b996818ac07b0b62cf3bdf0e02150eb640d2607
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The primary attack pattern involves redirecting users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a043c84c8---43818572434.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dp62vd93b359jcm6mvhbl6ukg9/baleruze.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210708_F74697038CB6578C.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc45099c849---80052207703.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/98134927454.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/pijiwumukax.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/2d2987ddf62801206182fed4bcc1c30b/23657714985.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/borulo.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/95045928144.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/riravetotin.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/pitowurubutib.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/43993220239.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/nolagexifarufobugaw.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/90572035706.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/86171063710.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/momikuredajatigopogivogag.pdfIn PDF document text
    • http://biomehl.com/images/content/files/nunawexaborugezobipu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/41049914335.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/52f6ceb1e33082f34c627947a7f188a9/netuniji.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/abbn9d41ssgj7h005qqgopjvin/wedole.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a7fc20304---89943359136.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/6efddd1f19ccad77419f121e670e68ce/47425309229.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b560ed4a5fc---bakajuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mais+pra+frente+ou+mais+a+frentePDF 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_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 18148 bytes
SHA-256: 0b73fb8b00f7bbf8bb8ab57103d6aca24acfe378313f0e1080e14a863a6d8899
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 10564 bytes
SHA-256: 6d913676f03b9000b835497dc7614bcc3eeb270a63332c2a4c78741a2e0834e4
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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