Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e28197c7cd82d08…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 21:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eba61e8c57faa8eae3a1950c60ab951 SHA-1: 782c8859fe55ceee08f10c3c300b455187619e01 SHA-256: 0e28197c7cd82d08a574bea8570d49ee034f9c8f8dbfb074bef7828eef358a91
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan threat.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9826

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://broadgatecapital.com/userfiles/file/woxexawupipitolupibed.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/45ca5da947af61059dcd43317cbbb84b/ludigubitimaja.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c0609ff5e39ab8f2d8e5088977016598/68606009158.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/vujesewijadomur.pdf
    • https://yuss.it/file/jotopugibajogutekabaxatol.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f46ce30dd---68274689460.pdf
    • https://dadesigning.com/daduserfiles/files/xekefegoz.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed1ecad95---85350959641.pdf
    • http://massintech.ru/img/outer/files/51148008319.pdf
    • https://netpage.info/userfiles/file/vufesu.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37729d9610---77659834828.pdf
    • https://medsplus.us/admin/images/file/94874019616.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d01956fb4---gakifekezibigefulujeji.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b57b3ec---77673584882.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/labiketixab.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607127ac8d5d1---kopelumufegazorogupifi.pdf
    • http://asbu.net/uploads/FCK_files/file/97807535881.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4fe4e92e17f91cbf1959c7ffeb1fb7ef/xelemumisidefudutifig.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee2d39daa---6669061086.pdf
    • https://acgroupenterprise.com/userfiles/file/giwanak.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/50585959977.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12600d5865---59214809699.pdf
    • https://upbfassadenbau.com/upload/file/velozubovaxoz.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8f968c36ce09242dea33ef5ac83da16b/fufij.pdf
    • http://rheinmotel.com/userfiles/file/36243081660.pdf
    • http://gayaarchi.com/userfiles/file/20210628184809.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=technical+analysis+using+multiple+timeframes+by+brian+shannon+free+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_off0000f436.bin
6d6b4657fb4308f7730fa292908ed5b713cce0d82aeda0b89063ff02dd6908df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 18348 bytes
font_01_sfnt_off00012218.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
font_02_sfnt_off00013a2f.bin
23d661f0779f04b1742a0cc01d16a49a699b27bc0ce8a46195b4fbd876f8cca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 11384 bytes