Malicious PDF — malware analysis report

Static analysis result for SHA-256 c107a772432e3ba1…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 03:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 128f0cf3e273e7bb1c18eb8b71b103bb SHA-1: 56b871d2533582932b9a4df729da7479b4001083 SHA-256: c107a772432e3ba1c68b6d796068ced03506cbb6d44a1cb93fa7a5dc20d84e8f
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The PDF structure itself does not contain readable text, but the embedded URLs and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bilcafe.it/userfiles/file/73094689371.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be1825e0b0---10345856551.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/8oc29g021c9ckdp4gogn055b2f/45982926542.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/fipotexazupix.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/59331201781.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/nefamozebefagodadaju.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/70570975917.pdfIn PDF document text
    • https://menu2uplus.com/images/file/51229592667.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/67191531816.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/bb41d0f9ba67b07b78e75eac4855796b/38162559253.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iitm9kr3uipujeusmbbb4pohb6/digukokejaliranixenadovav.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52d7c30a4---37858169845.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/gogogajovelinos.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/kubenoboluwolusawevazugu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d806e32fd---gupigiwetilugi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/30906720191.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ddff47366---69662906955.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/faton.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jaketemarejuloguvaj.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/gibixugigagavukiselamo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8878944ce---tomolimesuvezanuxugopen.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/70538094285.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/towusej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+de+yaskawa+j1000+en+espa%C3%B1olPDF 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 10988 bytes
SHA-256: 4b87c0ca5ff14cda0de3e2ca285b1f3464f80001d9c981b6a5e37ef798a0a797
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 17928 bytes
SHA-256: c358465e201b1f9b3bc39a548680315f2f4fadb2644fffde1221b23268683cf3

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