Malicious PDF — malware analysis report

Static analysis result for SHA-256 86911bf6cd27ebdd…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32354b44cbadb4209d00f331c71d6f9b SHA-1: bd22cb16631f153066f3faf8d5207bb11467e4f0 SHA-256: 86911bf6cd27ebdd05b7922680674a62b7dc5f88bd61adef679161c21e276369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://0900107678.com/upload/file/8101117088.pdf In PDF document text
    • http://hocikto.info/userfiles/file/sanofizoxumaxu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c973ea82e---lenojesexixi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a5a4d8804---4445698148.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3526b411ac52e234cbfee9fecc716b1d/gesekatisav.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/15618383191.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/tarexujidete.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e4e2abcd3ee168773d90969533c6b18b/82469887503.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/tesadobuvufekufufegawapa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092700c1aa29---pomumapab.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zajekarisixonazix.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/77663795802.pdfIn PDF document text
    • http://sgpeo.pl/users//file/zewun.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/newadatawamepose.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d40d9393---53302289173.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/08693830241d131667c5e97707ca13da/47890845549.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd233911d0---23791938298.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/merubugalekiriwokufiko.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/deb7216d7dd6d2cb58042ad4f589518a/ritopinuloloxelunozam.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7e77cb204df059f90e4dd926ade8ae83/40854127727.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8jdem90rphbah1qepegei4if5q/vipegixubusijewoseju.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/gakej.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/misimonurawibet.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/10904443540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+to+word+linux+command+linePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 17580 bytes
SHA-256: 509c0934bc7000c43a9536520d85a3ba3afb22c7b4fb13dd2bd3c8c431fe54a7
font_01_sfnt_off00013708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1F 11000 bytes
SHA-256: 40e341c5fa4ebce09be9d189f854731495f7e58d71efd9f862dc6646558afa29