Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d74310741bf43c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e94c064ad90c08e1d1e0309a7939a6f0 SHA-1: 8bca5514ca861cc89bf60323d692be841b2b9591 SHA-256: c5d74310741bf43cce9ec21f3fa4038177169194c93acb3564034c927fc06781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://churchtextile.com/userfiles/file/23475554367.pdf In PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3de622251d8fbf360bca3c40efbfd8df/27752546751.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/dugemonurinon.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/68137063833.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/mofofu.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///lugajuwog.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/tugujibokitipofiso.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/muwodurojef.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ccba038f8cc86aa9ff3072a49d8ecbc/lanovaruzapu.pdfIn PDF document text
    • https://vientangluc.com/upload/files/8371797442.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/k5n1rj0n67m12t8j808abb2ri3/nufosikufetupixil.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/60746411162.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/77670505483.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/suwukotunifixuzafodidipup.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/kolidusaxakinisusotine.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/besiwapudimibabuponurepu.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/pezuwipanipi.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/zapavinexunomaximifo.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7fc0caf0a---33533401549.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/kajuvidafosemefa.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/1594643030.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/seketa.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/28507988332.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2eae749db---ruxezuliwinatujolipapedip.pdfIn PDF document text
    • https://nexapos.com/upload/files/21594510019.pdfIn PDF document text
    • https://istanajp2.com/contents/files/rajutagoxikokik.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/gabefiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=different+notification+sounds+for+different+apps+androidPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10668 bytes
SHA-256: cf9123d4f7c8cc11daca135b4c502a96dd04e406b86dce7d14215ecb7d9234df
font_02_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 20352 bytes
SHA-256: dd6d4801a3bbf9dcf29a0342dfa6ec54b115e77c2af4b5a74d2dc52486e97334

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