Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c9e1425e14b2f7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 14:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e011f10f96f677ef8d04fa12b9ee1b6 SHA-1: dd9ab7b7d7b649bf277e06b3a947edba74f0e0aa SHA-256: 66c9e1425e14b2f71fe2e1aa66604562e721f3419e5e31b153df6deef4e33e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous PDF links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://akcjonariusz.com/UserFiles/file/jojonepe.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfe42f657---gelarowunoxepaxibike.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/64529521308.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c4200e0fb6ec7f1f721a896b7d56f048/tipazoxofol.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/34090104189.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/76f554ddfc6d93de6ad2a3f8ae98c8ab/xapatanoludi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/v2p5d4rai0mueruc75a5ulbumd/36898428085.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609db67020d22---makukogakemoxi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fazapiviwixakoliful.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tipetipi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2543712886.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/54502095136.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5gd966fl14tl32qt1bia0me803/45616977326.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28984ee2f---moxibuxebenod.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/75192350727.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/60047453038.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1af7be2194339fc2a03317d02f1a4281/numisim.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/innrk24096351opdruic37qq70/rofelokurasijawewizu.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/lebumoporusokididag.pdfIn PDF document text
    • http://krupongs.com/images/file/vurobelexuraposaba.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ced4d11---89466557799.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/zujovomezijesaxajome.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9de459a0a80f5953cc070d74e8c6b995/62903866584.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/6790032373.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wumepi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wubosuzotiwexulozez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2018+dodge+durango+srt+manualPDF 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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 18380 bytes
SHA-256: 32c369d7ed9a953b2db7cd7c7ad6cf68b0d59d72cfe01154612cd0ebb4333820
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 11004 bytes
SHA-256: 4e5ff79c2665819ee097dd6ef1eef76051e09b0d7a3242cc1e5cf9de59951239