Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1e94ea55076f91…

MALICIOUS

PDF

89.2 KB Created: 2021-07-17 20:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 306cd457aba9b170cffb6dbf1eba664a SHA-1: bcc1b015788e9687de57eb1c4983376157e8ab52 SHA-256: 0b1e94ea55076f91915b4c5318e34dc6f6c0126ff496979dbba4d2b814079a47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://shqinze.net/admin/upimg/file///18044914846.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/suludu.pdf
    • http://andlupa.com/userfiles/file/2974855417.pdf
    • http://hotechike.com/files/files/logoxutusowegofib.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b2524891a8dd6000b1aff56983ff78a/tozafukirivarojogenepipej.pdf
    • http://beijingxinzhi.com/userfiles/file/20210507041244_1398360309.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44682c413---53418453292.pdf
    • http://hurtglass.pl/upload/file/59989094060.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608baadf36a5e---kasetad.pdf
    • http://dotacjedlaoze.pl/userfiles/file/detasisewevagubawozisop.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1d5f6c1e1321cc4aa610872e4a233978/xutijeratu.pdf
    • http://novussiteyonetimi.com/uploads/file/20148291103.pdf
    • https://abofahed.com/userfiles/file/76041935624.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b819db9b188aea7cbffe3f7a604a5d8c/kabovir.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608441b437dbd---sulafojavuligux.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e1f097601946e7a1f0d8e573603ca276/75478172654.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/33b4505828a342c1abf2d3962edbd3f1/84339883280.pdf
    • https://grnca.org/img/files/files/54994388266.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/31b112641e7d9a39aba42cdc4deb4afe/78045174355.pdf
    • https://vinadesigndanang.vn/uploads/image/files/89897843460.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e07092422c0c903b08f7a1a3b69db7d/89522733433.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/48251766879.pdf
    • http://energo-winstal.pl/userfiles/file/661465323.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/57494a2dc94d43c7e26b19b31b0d1a84/rekum.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c50bc381b64---81956272091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=youth+group+names+list
    • 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_off0000f826.bin
12b9f7806e0ee590c44fbf6488f65a67c0e8652c3ec2b4969b88877cda67617a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10780 bytes
font_01_sfnt_off000110cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 16792 bytes
font_02_sfnt_off000128df.bin
5af552a067c635e5a7a6e1695609dd4136af6733cfb5bcfc722cce781a6d748a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 18004 bytes