Malicious PDF — malware analysis report

Static analysis result for SHA-256 3682aa3c40249261…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 11:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b79fc9814b27371246496ff50be2217a SHA-1: 430750f4e1450892bf085e67b194178a5dcbb6d7 SHA-256: 3682aa3c40249261e661899f03fdc9e5291aef858569a3ad39883d9d1e1c8564
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gadkowski.pl/repository/filemanager/file/12185188023.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1d639cb6ffc9a04dfaf2b3f5f9c6cf70/gokiv.pdf
    • http://jyjwqj.com/uploadfile/file///2021073017451352.pdf
    • http://oasis-inwaste.asia/files/file/kepifedewuzewumiru.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa098bce6---33674020825.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607795117abfc---77570794226.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f106e4d481---89293708778.pdf
    • https://gangnampools.com/contents//files/lorixasizubosob.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f939293615---82373327728.pdf
    • http://mondoacquapiscine.com/userfiles/files/10601500348.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acab9d5e0a---soxuguzo.pdf
    • https://alshaabcoop.com/userfiles/file/94196941371.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2f54d5f02251dfc1cfee7bc68a402255/85742780610.pdf
    • http://studioschicchi.eu/userfiles/files/poteminadogu.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6dc0658ff95883848c413d244a3c777f/serukidazufuju.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/zawurupapipagilazonopa.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210825_775469C4C53B9A6A.pdf
    • https://bselink.com/userfiles/file/dipojejirowogikameli.pdf
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/vikodurika.pdf
    • https://hantverkarenisandby.se/UserFiles/files/843271595.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/xisinewesitebo.pdf
    • https://lotteppta.net/beta/assets/file/xubamidufazegubow.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bc27ac52---maxagizizevurirego.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29ae9b7cbdd7ccef5e4b45201279e73/vesemedusatukax.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f8d61dd2eecbe4ecc35a13d66a9dd19e/kuruveferebaxejoput.pdf
    • http://contelex.it/userfiles/files/64876818712.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=basic+computer+science+interview+questions+and+answers+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_off0000bd0a.bin
b5bbf2bd2ff8d6de6c7767c317df031367753a6034a68ac66e86fc3eed915e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0A 15856 bytes
font_01_sfnt_off0000e514.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 16792 bytes
font_02_sfnt_off0000fd2b.bin
445acad3db9aba448e663af8fdced6af9c7d63f689b324955d2f7b9d527c3330
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 11188 bytes