Malicious PDF — malware analysis report

Static analysis result for SHA-256 62571b33848824bc…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 12:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe08ac0cee1be1a972051358f576e32b SHA-1: 78c257834068e26df20695802f42034c41654c51 SHA-256: 62571b33848824bc51d938744acc7ebaf19de8dd6639d7631db522f2a4a0c21c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations used for hosting malicious files. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=coffee+on+fasting
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606db7e83cc18---fisifopopawiwu.pdf
    • http://prime-standard.com/piceditor/file/motikumalekoxamigitileg.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/mamosuj.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7c00b600d71ad0b8464ff78b3a106a09/42813133328.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606efecf3e31c---27217081764.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bf30f932ee38e27306210c4c1858d262/lijume.pdf
    • http://re-view.online/fckFiles/file/kuwiwegugubi.pdf
    • https://resulgame.com/calisma2/files/uploads/wivovujabulimelofixatugop.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0ccc6124221b26abbc0e7db55f3a3020/wudeduvovomederivo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b31a71786e5---23032282568.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/673572c176c31a70bad282292d51ea75/34106232825.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f595e5800---tagara.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d0c702a---kolidijorokurarubufofifu.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82a2a9afa---gobixajosalimuzuz.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088228e9f68e---47157613907.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2f93eafd---wasidutolukeruxup.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/zagofifivajal.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/78572756864.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/juxirinedotaxojeze.pdf
    • http://archerelectricsupply.com/userfiles/file/57712447508.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6621b35d973455c9a8ae1f4da4bc0874/97631992708.pdf
    • https://thepainter.asia/upload/files/zuxemugob.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d43b6dddf47---48312548532.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0e098dc9---36667642800.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba0c87a1a6---98632594232.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbcbb861e---relifatoka.pdf
    • https://paperland.bg/uploads/file/zezuwerasinetoxu.pdf
    • 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_off0000fc42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
font_01_sfnt_off00011459.bin
f1c068da03c1874fe3668922fcbc13c25342af83049ae7ce244be68fe4fe7bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 10276 bytes
font_02_sfnt_off00012baa.bin
79a2bc8b91e7a4a7ca46a12c3694c6f63102fa79c42b6f6af9af19bbfe3bdfeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 16936 bytes

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