Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb88b6a00f1453b…

MALICIOUS

PDF

90.0 KB Created: 2021-06-25 21:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b223a9ff5d1d69967248620ef2ec616 SHA-1: 2cf387b346d4e501c5f7f924a7d0665485f0e9f4 SHA-256: abb88b6a00f1453bf3a62ce24f58c3ebdb4f89bbb4a2a0be347989f69e45491c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload directories. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://agrobud.net/uploaded/file/71758499621.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7356e0fe63---28877273172.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c51d961a---41971739211.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0b9d172e2e7fdf99a58783655064163/lezepovubumisedajiwuwo.pdf
    • https://brahmagnanam.org/fck_uploads/file/wajadizoxupija.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4deab9fa6e3161fdd245d29714148ec/kuzulajepinagamojeke.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qssur94ntr6viglidv339q81qg/tumebud.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/1b8808475b34e2a53e9abccdb5adf1a3/25739901106.pdf
    • http://comlark.ru/userfiles/files/64128851162.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/zejetugagerumimod.pdf
    • https://giorgiosantinelli.it/file/68130064727.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/86bdd96cc545a6f71d8b8d3613f379ef/84781518976.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210623_4B6916C17AD726F3.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ad12d66f---bekosavetetulelegujekak.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d247705122e---sotekemoluni.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4fc892a17870fb9fefd28a3ace522a68/vebugobetovodamap.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45e6957fa---40586918693.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a08b7492---57800917239.pdf
    • http://lovesushiscv.com/uploads/files/60884657935.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609718bda929d---38724836302.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5995f9ad3fa937aa424f97d7ad6cf5f4/jopataluxibok.pdf
    • http://artecgroupservices.com/imagenes/file/xezudizovizajibatanasiniw.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c671cd8700c---42735735240.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dddcad90b7---basuwasuzemebapukewosili.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oasis+gulfport+water+park
    • 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_off0000fc97.bin
d6be82c8b2ce3c777b9b014a74cd796eadc1f397f512696a7c507b1127c7af7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10732 bytes
font_01_sfnt_off0001158d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16792 bytes
font_02_sfnt_off00012d9f.bin
7ad0511c7709c45a00bda8493d8d02d24136a50b6e88de48c0bff91c606d5692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 17424 bytes

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