Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adb029b8e4ccad2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 11:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8181e7fae9fbab21081fb6005bb824d2 SHA-1: 13c68dc086ab380cee3631e8ca00781445036e8b SHA-256: 8adb029b8e4ccad2e8c9a82febfe97d6edecea4e959f0a7f045d7d1d9d084dad
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malware, aligning with spearphishing attachment and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://stormester.no/files/file/61131325880.pdf
    • http://4998horo.gmmwireless.com/contents/files/82835317111.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132041ac5e2d---juxigasiv.pdf
    • http://sun-apartments.pl/data/pages/nonusawenawibitezoved.pdf
    • http://hidropro.hu/upload/fokonabezifogekarofa.pdf
    • http://nuovojob.com/userfiles/files/36286434136.pdf
    • https://resortweeks.pro/userfiles/file/64175197076.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614a309bf14a0---79048080683.pdf
    • http://synphabase.ch/upload/file/89874146057.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/vedijibutif.pdf
    • http://driver-jazda.pl/upload/file/34978474685.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/68496331152.pdf
    • http://mmbc.cz/_data/user_files/file/37481948589.pdf
    • http://alcantara.cz/data/file/106090982.pdf
    • https://pottoka.info/files/galeria/files/62914136199.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/1881370186.pdf
    • http://baaningdoi.com/file_media/file_image/file/nalusoxodekijubexilekobo.pdf
    • https://8cj2aja7-8mxb.com/contents/files/98612549160.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/potexenisakedesu.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f10e496e2e2dc8e7552c09cb927d9ad9/37662647534.pdf
    • https://civilkontroll.hu/uploads/file/77817093524.pdf
    • http://envisystem.com/upload/userfile/files/64052789054.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_B73D49E7C53E7BF1.pdf
    • http://preiswerte-unterkunft-papenburg.de/mediapool/62031133060.pdf
    • https://rotitelor.com/contents/files/54227245793.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=caller+information+app+for+android
    • 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_off0000e9f7.bin
00a6de36c78eb52b7c7abe223fb07a15093f67913e1404bc0807a8c8d08b1907
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 10520 bytes
font_01_sfnt_off000101d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
font_02_sfnt_off000119ea.bin
efd80123860b2515cb84c239ac2ba178f180a0455a5ac42bb100fb77aeb81a68
pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 18056 bytes