Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc532135f1bc750…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 03:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c953e6c44bc285224aeb61d628b6ebc9 SHA-1: 1e0e90873a94c0b7f88a47fb785461c56a0bba7a SHA-256: 3bc532135f1bc750376e760ffff7d544c62a4470548ab6cdb38da473dbc28088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to disposable hosting, likely intended to redirect users to malicious websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://queure.ru/uplcv?utm_term=icloud+imei+unlock+free+download PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gpl4qeppr57pruke3iiinmvhbq/vomamedonen.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ratofijopijavajaxotijatej.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/22113879831.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/55392392666.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1ce5446c---61639564758.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/tiresusarafulotozulegej.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d4b46652b57b7488490e7f1a5858ed1d/10273063948.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/napamiroxewafetebadovo.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pevovotazulosovo.pdfIn PDF document text
    • http://fruitsad.pl/images/file/96521921848.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pulonosibudivujutaja.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/folepekamilosizup.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/72942537078.pdfIn PDF document text
    • https://angkagenap.com/contents/files/3684243151.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tcvu0e3r8u9al7fvqbrhj8sba3/vatarozigov.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/katalodese.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/vetupapolezevafed.pdfIn PDF document text
    • https://mentormedya.com/files/32550689018.pdfIn PDF document text
    • http://tyextractor.com/d/files/gategaj.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/16079396540.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/futavitarogiwu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1a69709c---josaketeberapifidiguj.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/11598239503.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_off0000b0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FA 17812 bytes
SHA-256: c266b4c453e568af738c81329203a2cabb2201d7a57968df62bc27f5bbb0d09b
font_01_sfnt_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10600 bytes
SHA-256: f91ce8042201964041a90bd403d9cbd84fc1b1968fa67af89e8050603f6ee0b6

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