Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be0b133f651ede8…

MALICIOUS

PDF

75.4 KB Created: 2021-06-30 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 502e58850c5ddde404fbdf5d6543ec88 SHA-1: 4311367b8d72c4c65619d017d731f9747098cf03 SHA-256: 7be0b133f651ede8f41c5337b42042a672b44569b766e64e3a562a25003a4a85
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bidmitt.com/img/files/file/gisib.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d61b03b1---junexofigop.pdf
    • http://pneusmarene.it/images/file/21198478531.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/94dffdd0b1e6c6d476d8c8260a1a61b6/36815323914.pdf
    • https://telenovella-bg.com/files/pubigejadotulikan.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/20b63d8e1315f0d06da7a59bbca2ee6d/jesakusodogatanokeg.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/tanagek.pdf
    • http://harc-ias.vn/Images_upload/files/gitolikos.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/46215d6fee907c6c0ced996f3519c3b2/36338600652.pdf
    • http://bassbasement.org/userfiles/file/81510339778.pdf
    • http://bukhatirhomes.com/userfiles/file/54675078221.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210602021407.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f066a55b38---72179710410.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608167854b12c---dufisejomitolifumovowat.pdf
    • http://iglozawiercie.pl/zdjecia/file/10928453778.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ec0fc345af5678917a10dc101405a90e/kazanevabowugiwukam.pdf
    • https://nanosoft.mn/images/content/File/xenokix.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/napuduf.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/tanasufegagedip.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/820762019af75fad6acc93e166f62d7e/nusagimusapu.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/pukulawezemekakuworen.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/43534809981.pdf
    • https://sindonis.com/userfiles/file/64409308029.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nba2k17+android+apk
    • 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_off0000c253.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 16792 bytes
font_01_sfnt_off0000da6a.bin
627222bb34767cfb65adcb8f9b06685758e503faa63569128e676dd8f4908577
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 10372 bytes
font_02_sfnt_off0000f1cd.bin
e38db20d14fa34f51bd8cf53f3e0d678fc730dc4c153cfefbd2bb848c142b3a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 17944 bytes