Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92043ea7794a691…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 08:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fb9873b61cd255218165aff8762f45c SHA-1: 6e69b72b0fc80c4f06adebf0da479ca330de907c SHA-256: a92043ea7794a691808a381471d9350af52a95f8faa259cd4834d9bcc5824ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://smidgel.ru/uplcv?utm_term=quantitative+methods+for+business+12th+edition+pdf+free+download
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/70624803962.pdf
    • https://dm288.rs/slicice/file/2760375890.pdf
    • http://timeyear-v.com/userfiles/file/541386407.pdf
    • http://pvvc.cz/files/16992881904.pdf
    • http://xyr59.com/filespath/files/20210908120701.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v9k1oj6hmb1vf87m3953far2d4/12005594985.pdf
    • http://anhbanglaw.com/userfiles/file/fujimuw.pdf
    • http://studiorinaldibedin.eu/userfiles/files/53502464198.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e3f9ab79d2e57ff3cfe3e0cc39189c32/61632516630.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qo714lmqpgs972se4a906jmpuu/34586509192.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6eb3p01g32fd2ebop1dvmpcavv/jolulegozabes.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/juvele.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce36e5291---54936892651.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073501e53a85---wojakuguroxazufewibodo.pdf
    • https://andhimazhai.com/images/files/99915385625.pdf
    • https://coebmsf.com/userfiles/file/wuzilavanexixosudajuji.pdf
    • https://fo-prefectures.com/pages/files/latibapofulazeroxu.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/66110510853.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/pozewupilelezizote.pdf
    • http://suankaew.net/upload/userfile/files/65693787017.pdf
    • https://asiarsolutions.com/userfiles/file/memizuputopekaxogus.pdf
    • http://forum-auto.ru/data/files/zazovegobogoj.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_off0000f951.bin
a37dba7208411ccafa8d434a9cde053bdff89ea2a63bbf2ef554741ecbf291d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 11384 bytes
font_01_sfnt_off000113f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 16792 bytes
font_02_sfnt_off00012c04.bin
a6ff1a38805db58ab4bffb4289b2d543873e6fb29a4b335f713de706c3c75e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 18820 bytes