Malicious PDF — malware analysis report

Static analysis result for SHA-256 a684067ee939daf7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 08:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5b42a969a082588bc60d32ef9849baf SHA-1: 47d2b79cd01e2cf5e35f2f1666c7df99605a949f SHA-256: a684067ee939daf758f2e5482c38da276ffa0cad15df2cce295f3414906f4103
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised websites or domains designed for link farming. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nyig.com/files/file/19459397497.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5457a58813e56bc3da36c12017e6c9e9/95180305588.pdf
    • https://flomogroup.com/upload/files/33612166092.pdf
    • https://hagakure.by/upload/editor/files/97720138842.pdf
    • http://123flower.doweb.kr/upload/files/wafon.pdf
    • https://rajakeempat.com/contents/files/mulenedogemafuwexesu.pdf
    • https://kalashad.com/userfiles/file/pupuka.pdf
    • http://axwelindia.com/uploads/difazirakubukirovo.pdf
    • https://taxfirma.com/userfiles/file/vebemupijavenamatanis.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/1795434330.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c68d4fc---raxepulobibozidavop.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0d8ab9c---begalomunixupubif.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8e48b8fec---61421277396.pdf
    • https://path.mn/userfiles/files/29748222643.pdf
    • http://casadiriposomarsala.it/userfiles/files/67099196034.pdf
    • http://njxinbell.com/upload/files/wumutopupilulasazelenov.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/depirirajanokukuz.pdf
    • https://semineebrasov.ro/printuri-fi/files/70951684293.pdf
    • http://workontext.ru/media/file/terarugusus.pdf
    • https://gryf-wet.pl/ckfinder/userfiles/files/99605305493.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/53343785894.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gta+lcs+download+for+android
    • 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_off0000ad47.bin
e8c75fe9ef74dc4a59a2ebbbf5899982fed07c6ab9e57e646309d5d9958e6834		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 10460 bytes
font_01_sfnt_off0000c536.bin
cdc8eb0e21d85cccd7e79d471a1b6ee0b02a867b73a257657846a39b451fe976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 15020 bytes
font_02_sfnt_off0000eab1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 16792 bytes

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