Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed956ef02e94443…

MALICIOUS

PDF

82.5 KB Created: 2021-08-11 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4a2987520bdaf9e13e0e40d1b02d68bb SHA-1: bc4494357a7a4b157b9f71f72bd4a5bd72799aeb SHA-256: eed956ef02e9444312cef649f2c0e9baf03825f0350ba90602d08792b77b6175
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8320

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://140.121.125.49/ckfinder/userfiles/files/20210807_091921.pdf PDF link annotation
    • http://vattucongtrinh.com/userfiles/file/pesetiwufomu.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/bula38mg346loqsu0uvgbthq06/54641442467.pdfIn PDF document text
    • http://cortabellanews.com/userimages/xaratavatonupawijag.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f32c966cd---87699876516.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/xarotatijukamegubemub.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/17885538267.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/sazejigalunivonebefod.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/07b7da64f5d4160346ca444f6be23347/17579552750.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7e446e2f---nebiparezenadesip.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/tafojapizarenanitam.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a086c7dbf9e---minanut.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/78281812507.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/wilida.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/62788562965.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/29573270768.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7e1750529cbbb98b8faa5115c1f6a814/jesaj.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c84e1272---28468894814.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/3397753653.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/43452245971.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/30678237832.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jco1pfakbg0qhbkkraekp339np/tonolemojirebagutobab.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/kidirolijazalubowub.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/94365662330.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aac42b85b18---23921303010.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/pekifotafubutubekanaxerup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=en+sortant+de+l%27%C3%A9cole+renan+lucePDF link annotation
    • 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10544 bytes
SHA-256: 8750e8f073452d93707a630a83824803ca0d8a574884be785bc3b2691c707b5c
font_02_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 16472 bytes
SHA-256: 768cd711d40776d60e1401be57029f987a583172e0953e518ef8ffc108dba0e5

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