Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc74565c5aed3b4b…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 01:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39bf1a3b356b18bfc1158301f371865 SHA-1: df2db313e49218dd161f71049a0c930262039f32 SHA-256: dc74565c5aed3b4bd836170ef8eb5848e0b86e495382580b20fc38e971f6f9de
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 functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely to distribute further payloads or conduct phishing. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a937ca4b---xixowozogago.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088ff579d7ae---98847059277.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a149928c1---pivejelotoxabekumalafel.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f8fb5f26---86443523018.pdf
    • http://trans-serwis.com/userfiles/file/29326444369.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2cbfc26dbfa2adeeca379ba926b72a4f/56847322907.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609135e2555f0---zomelosisidozekewop.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f821soedbm2dhe7r7oo2j79r15/65170178218.pdf
    • http://pphu-joanna.pl/fckpliki/file/98101525272.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a820813e531---novewid.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4a613768783602b7e78713ddc9ee81a2/1609219776.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e120ac236---13981769547.pdf
    • http://aimecostruzioni.it/userfiles/files/40503462297.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6c5667ed3---rutodozinojisikojol.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be339ad7666---45559434135.pdf
    • http://jaatkinson.com/userimages/31924051085.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/56bqn8a0j8gbskunrbbi918693/jomikakesikosawow.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160909c49b9f8b---kamoda.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/efb28a0abd000f55a148f69803a0579a/wixurevadaxemeginipitowem.pdf
    • http://blpest.com/UserFiles/file/doruzipaxukekimubav.pdf
    • http://appletechsolutions.com/userfiles/file/3587406135.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=evs+project+on+eco+friendly+products+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f420.bin
da01fba3da467f7c92f4765bf1eeae91446378cac4e6ccac0b92a46116b328e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 17504 bytes
font_01_sfnt_off000121b2.bin
c36fe850cb0fb167e68f41b4e971baa54fe0d8ef43251940221a3fbad0b31b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10844 bytes
font_02_sfnt_off00013adb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 16792 bytes