Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fef99c1a8fa524…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 11:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52bd0df779f3d36075e91e69dd51178b SHA-1: 6f3207cba914fb59076d6eb8721ff962f4eee8a3 SHA-256: 62fef99c1a8fa524bf0855dcb68e57a92e137494412336235224580aadbcb896
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://tepatsasaran.com/contents/files/18112823482.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42970017262.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/98370500855.pdf
    • http://st-johnson.com/Uploadfiles/files/tikaz.pdf
    • http://pm-ural.com/uploads/files/16306037728.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/mosigobanuledovu.pdf
    • http://pescepiana.eu/userfiles/files/73826114803.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/27pua4bk5gsp4352vce1bjm1e1/61356378876.pdf
    • http://historia-bfured.hu/userfiles/file/95716300892.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/11354118219.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f986108311---widanepotiwite.pdf
    • https://invision.buzyhub.com/files/ropuxuxafujilug.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/54360234272.pdf
    • http://wellgroup.cz/UserFiles/File/pakamavosufotugu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138965defd9b---61633495552.pdf
    • http://canadianrockies.info/files/file/mumozedejifabubidirula.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/ruzurojur.pdf
    • http://gardena.crazyrockinsushi.com/uploads/files/gezewiximete.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae8705398---sifasuf.pdf
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/68712556109.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210908_435C71F6F95979AF.pdf
    • http://growlink.biz/userfiles/file/gisivatodevovilamigi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9bfaa7f1a---jegajibi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+setup+kodi+on+android+tv
    • 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_off0000d782.bin
aaf4691842ba716a3f17af1bbcff4853aeda4aa6ad7520bc38c83713d78b9620
pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 18072 bytes
font_01_sfnt_off00010661.bin
e2c3ddda8fa2cbed55edd8017539201c54169e5a1489857cc99fe652aa6697a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10672 bytes
font_02_sfnt_off00011f0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 16792 bytes