Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33181930755820f…

MALICIOUS

PDF

83.0 KB Created: 2021-06-26 00:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97273e3afa945e20858fd281c26066f4 SHA-1: 751e27817d08e59fa93c1ed17ff4d67001d6d693 SHA-256: d33181930755820f747cbc8d9e8adc26893b65c352276f176ecb581b8e87a76e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised WordPress sites to other PDF files. This technique is commonly used to obscure the ultimate destination and evade detection, likely serving as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/cb4e216da570b53802c428681d0373e2/tojawamimeperon.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2ad48d9bfb9ceb9faaae8c346af4fb88/32708483981.pdf
    • http://allprintusa.com/admin/images/file/73028532818.pdf
    • https://smartcirclegroup.com/userfiles/file/muzozivulakenavefasarered.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d395af5fff0---zuwiloriv.pdf
    • https://vpntraffic.com/upload/files/25952025317.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nt14agh0dlqletas2a0sl0nd97/wanotibibexire.pdf
    • https://cleaner.pl/userfiles/file/xiruwanapimupo.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6vlu8jo6j1oss28gvdgpjm9cu8/vefevakajas.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/53c7c1a41d35daa9ef0b411fef6589ec/74002771030.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079053b17871---55171439624.pdf
    • http://cephedanismani.com/images/pages/file/koxomaxupubifosuluvow.pdf
    • https://hyundaia.ru/userfiles/file/26644158209.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1q9hse7f5417cm0lvekgb18pb3/tirojitoguvakuxe.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0e395432---8371560477.pdf
    • http://jubileejec.com/userfiles/files/83295259431.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/narogafojawomuvareroso.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mj1a8no60o3bt9am1mnei5b9bg/venameki.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077505599e55---84291684997.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09b52fc03---6380253592.pdf
    • http://pogservice.ru/userfiles/file/xesuwojinikofibuxukesaxun.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0bdc75a1a---natebesop.pdf
    • https://tigaintan.com/contents//files/33364260129.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d1479827---momedumojuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+meaning+of+gaap
    • 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_off0000e365.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 16792 bytes
font_01_sfnt_off0000fb7c.bin
e957c910d99571c124e793d49e5b8861aa536ca812c9b7cd770d24a7b70024d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 10356 bytes
font_02_sfnt_off000112a2.bin
0b31ecaf68cded8d404b8ffa624612d672f82465dfd37e11fb6f266eb8ae8159
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 16984 bytes