Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5cf3ecb1540db5…

MALICIOUS

PDF

139.5 KB Created: 2021-06-29 09:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e59ffd33c2c88b4e891046e239d271fb SHA-1: 703db9eadbd9a3507dc10b4f9124bee39d270c36 SHA-256: de5cf3ecb1540db58a930e1731d8a7fa426a9a17ecd7c3cce6a7e9a5a19b947f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, some of which are hosted on disposable domains or use SEO manipulation tactics. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8849

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://nomylo.ru/uplcv?utm_term=fundamentals+of+power+electronics+ppt
    • http://newtarrytowndeli.com/uploads/files/98289628768.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/0ecfb452cf497e0621dac0aecde2a38b/mipote.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d54acd1f---29447542995.pdf
    • https://alzubidi.com/userfiles/files/bezumufiguwav.pdf
    • http://applexin.com/ttpsea/files/file/taganuzefotixisubutin.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/74df09edaa07254e19a46df946241763/gutuwajuf.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbac4ee36---tesozonen.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0d4q4bq15msrlsgcq1glp2puio/wozuvufutosulik.pdf
    • http://mytmbc.org/fckimage/file/33782212429.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/32d873576884c92e4b1e44beb508bc28/19002993401.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cf241c36f8d---22976821827.pdf
    • http://akkoryazilim.com/userfiles/file/44824060266.pdf
    • http://yogo110.com/userfiles/file/kasof.pdf
    • http://garmagostaran.com/Upload/file/63216684925.pdf
    • http://fantalife.nl/userfiles/file/panadunefexerux.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076136160ed9---41324545498.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddec45127---wepatebopog.pdf
    • https://juhaszautovill.hu/userfiles/file/zibadudasudigepupumasav.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae6a920a0---64555045452.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072332e3b36a---92190743460.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98906011595.pdf
    • http://biosite.ru/images/news/file/33763850537.pdf
    • http://dok-vo.ru/userfiles/file/30641839647.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231b9b9f8c---58569412378.pdf
    • http://www.saito-ken.jp/userdata/file/ziziruwodupunemamifore.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb39d54a14b42b8cd1c065f905c43f82/59657672324.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fb.bin
239ea01482cd1264ebbe2718829daec5116403442bab956d2d9170ec468535d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 69844 bytes
font_01_sfnt_off0001abb6.bin
2232322952d4968bc454db7df8deff295f72402f0248a5ba7b288e55ef7a08b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB6 17308 bytes
font_02_sfnt_off0001d89b.bin
8191676460e1115bce3573289ee465164c2c4560c37d6eb4596df29c186aa0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D89B 10944 bytes
font_03_sfnt_off0001f203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F203 16792 bytes
font_04_sfnt_off00020a14.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A14 16092 bytes

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