Malicious PDF — malware analysis report

Static analysis result for SHA-256 1157b2c49a19b926…

MALICIOUS

PDF

87.7 KB Created: 2021-07-08 07:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45b7c83482d955672e53fa08dcf1ab18 SHA-1: 3c21af3e1cc4c72b6600bdac39af13e27b0e73e7 SHA-256: 1157b2c49a19b926a78ac3fcd14729bbb532fbedb014f4fb670f156b32e5ff98
176 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://basyapiemlak.com/yukleme_klasoru/userfiles/file/lubizepuratenalime.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160901ef7ea837---99159255933.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/tilipalosexusu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8a8fea465e3b6d5dc6edf8afa27bae83/ralaxozitukopunutegu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/93372383126.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076766943819---34299591759.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bezora.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d22c5e2385cc186e6d83e74cf890aa6a/85380586802.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1477c4facfa747dc9452f661bd8f565f/15818871995.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccae53993---18690506780.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/bdc60ae56bf98cc3841d2066054e7f41/96221998426.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608354f21a615---dopabasukasew.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e4d5b68fc62470a05aa0cd24ed22527f/lebowepavakoferizesif.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/suxokanu.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/potoramesawiju.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/levonedusuput.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tmm5cok9q5co75ks3cgdr6ml1c/dirozo.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9fb0f5883bbfbd75b3072c6f9a7c3828/30882916028.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/17253717641.pdfPDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c906c05024440952029883e92ff33cdf/xupolozupaxadalos.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836c6f02f0d---nuwizegimazawetexutaxuz.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kelozire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+whack+the+thiefPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 17744 bytes
SHA-256: d87db808e93f625404cfd49ff47eac73f36c54dfb902d09c216a6b1eed15cede
font_01_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 2508 bytes
SHA-256: ceeac5752447583a003f330c788b16d1b25b9571b6eefe36aafb6cae9317e901
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 10484 bytes
SHA-256: dd8e82a67e1746edac13bbacd7d7e166479fbc50efa61b74ab5f61841f71216e

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