Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b87dbd6c9470dc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 06:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b3d1e8449e5da3f1989c0e24c4ae84c SHA-1: 7f7e99e633d3a7a24e9bccb13f24e88515fb3ee7 SHA-256: b1b87dbd6c9470dc33e025f0b2986aded22171d962c84a5ac3d220f401973a47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links. Several heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting. The presence of a URL with 'war+robots+unlimited+money' suggests a lure for potentially game-related phishing or malware downloads.

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://synerhu.ru/uplcv?utm_term=war+robots+unlimited+money PDF link annotation
    • http://longbeach.ilovepokebar.com/uploads/files/robatuvigume.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/69001867735.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94c867ead---katumaxesaso.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/68827335479.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/83006151503.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/22116532302.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/42953735141.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fapugijatuxinegefunusig.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/dtrbcuvhlppa3rkeg8oerjc3ap/gebabobejivasadose.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pobox.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/19344336044.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/fodokopusanekol.pdfIn PDF document text
    • http://rayanchem.com/d/files/norutufobebop.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/11255840326.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/53618508460.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/zepakotolitinag.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/bumuteforebifaw.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56488385097.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7612704d---konikoramukaxaro.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ccb53c824f61089500ca49ddf58d3ce4/4932349288.pdfIn PDF document text
    • https://interconformity.ro/images/file/zokipora.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/71313933609.pdfIn PDF document text
    • https://masihpt1.com/contents/files/83430200734.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lukelizogufubawulotel.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/zebopezobirikisilibubire.pdfIn PDF document text
    • 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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 17140 bytes
SHA-256: c4f9a3553cc35dbb938cc3b73286b0089916b4f27bd41382e5357a51961d81b3
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 10756 bytes
SHA-256: 5a91525ba7b3e42d02bfcdc2c8c513845f3e2dfc162c6f1468b7d5c5b860e14c
font_02_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.