Malicious PDF — malware analysis report

Static analysis result for SHA-256 176d23e04159e9d9…

MALICIOUS

PDF

93.0 KB Created: 2021-07-12 23:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 675e2bd4c5b1c7a885746c51556b3c13 SHA-1: 5b97c0c44570e3adc63cc015d8bc87d99a3aa209 SHA-256: 176d23e04159e9d99ecf165e864c5adab8a1d357a44ec84d6e5170ada61373f5
156 Risk Score

Malware Insights

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

The sample is a PDF document identified by ClamAV as Pdf.Phishing.Trojan. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF with high confidence. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links to potentially malicious sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160911e6fd2df0---58799769104.pdf
    • http://www.heksan.com.pl/file/zazetemositiwulilirokatog.pdf
    • http://parkwaywest1974.com/clients/861606/File/81530776990.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9e70bfe8c541819589e1e5dcdbd40da0/98579751420.pdf
    • https://davaocarrental.com/images/file/pesilarabakexifu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b43ab05938db6ea0adcb4a7a4c9aed86/27991445006.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0c8bbc1---tomaluzufafu.pdf
    • http://wabasnb.com/files/fckeditor/file/193199290260b8a99c565a1.pdf
    • http://albino-pitti.com/pub_img/file/70914251059.pdf
    • http://emurus.jp/userfiles/file/19262369320.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1575cbff6b03cc880be9ae3de199c1ce/41815194320.pdf
    • https://acryl-bg.com/userfiles/file/18328808556.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9397afd82f438ba7acfe54661ff27dd8/77529133661.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/8859942921.pdf
    • http://angelescare.com/userfiles/file/kitoxexumex.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0db1ee34585184211758d275a11ffb5f/84741621147.pdf
    • https://indiantalentjunction.com/milan/media/godadilajot.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160757d410b3ff---94657503170.pdf
    • http://hongdacable.com/d/files/68184980448.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9c799505---86752585029.pdf
    • http://supermarketdv.ru/files/file/32749195523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sow+his+oats
    • http://e1pl2.nazwa.pl/busy/fotki/file/69269539507.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_off0000eba9.bin
bf0257f76170b551e9a42c673b71f709f124109a39eb19c5c63bcdd5ac7f9388
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 17432 bytes
font_01_sfnt_off000118ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 16792 bytes
font_02_sfnt_off000130d0.bin
4f203ea89198526dba84bfacc7f0cdc98ba3b67042ee0379ded41cb144f43fa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 9984 bytes
font_03_sfnt_off00014720.bin
5d385c0f3fd2c49778a5be0cd38588515c37a5f6a719de6f84beac22005bac0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14720 16360 bytes
font_04_sfnt_off00015d96.bin
cf0679219955c279f1d3c50e0370e294ff44e769496d653ecacf363d8a39c9d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D96 1816 bytes