Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05fe65afb6e2a5c…

MALICIOUS

PDF

82.5 KB Created: 2021-10-08 18:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 18e0e4e935d16a89152c44983b9c0574 SHA-1: a5d33bd26d96e85c2f0e4897d236b8e4094e5428 SHA-256: b05fe65afb6e2a5cd5af00c0c9593ae69dc7b885ff65e58068e4d0e5dd959df0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

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://inwebjor.ru/uplcv?utm_term=michael+day+lewis PDF link annotation
    • http://tmkb.org.tr/ckfinder/userfiles/files/kedelusolupebev.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/13057366768.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/34208203866.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/dc6b22593393b1342d595475922de1d6/79367029962.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/65193083397.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nirus7hic08h7vnl8hrovhqcog/womevosogoweju.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/3189939666.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134528c818f2---40668601601.pdfIn PDF document text
    • https://signika.pl/Upload/file/vavuvawelidaligikepoxul.pdfIn PDF document text
    • http://iviltra.lt/images/files/sigarasiziroxu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/getof.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/panujig.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/julizale.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210927095849604.pdfIn PDF document text
    • https://arsenev.verlauf-ekb.ru/admin/ckfinder/userfiles/files/borogig.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/numavudukuluzasikebudi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143aad484692---60821438595.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/88128811031.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/guxefatubaxubowopawejed.pdfIn PDF document text
    • http://lagrupacio.cat/file/7972185563.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0aee532ef52b7f55319d3ab786b53552/bilulagilefasamebeja.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/31825885099.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kedepijumapagolux.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/kiwaxurosomasopu.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 10236 bytes
SHA-256: e71774a0ca36f77c2911c61fcf27677d76ade6cd59674feb7683df015277a34e
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 17368 bytes
SHA-256: c39589cdc98859fbaaba1e921a48c9710561a8a61bea6dfa07dd1748920f2cba
font_02_sfnt_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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