Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b0b5f88d51601b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 12:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b612fd0198724479ecfd52d7b7b50c5 SHA-1: c5ef5957bcee9dcaf02c0000dc1853978b8c6158 SHA-256: 52b0b5f88d51601bac039620d10441dcdd209f31aab80284ac8264ae4175bd19
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous heuristics point to the document being a link farm, with many external URIs pointing to disposable or compromised hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=minecraft+pc+latest+apk+home PDF link annotation
    • http://stefanourso.com/public/userfiles/file/82279153988.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/59376867320.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/damofamipevagoje.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/vezafolutenimoruwemela.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tapokunikad.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/boremuxebim.pdfIn PDF document text
    • http://lejuriste.ru/files/file/goferozalagixofob.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443d2ad13fd---vagutabuxekubudefufinox.pdfIn PDF document text
    • http://d-innovation.com/upload/files/polaxuki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/22810285783.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bifizexoxijutopepesav.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/31869902146.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/019c2ef377764006f7ab86ab1b67e9cc/29166483499.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/govazebo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomajiju.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/30913300579.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/42320877895.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/c38bbcebl9l1j523uk4idfmm81/bopesozifakuv.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/dutudutom.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161321e7bf1b19---230428920.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/kalelakofudawetopozozi.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/zitezowozi.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/54451331418.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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 18032 bytes
SHA-256: 6b641c83b8002c633dccf0e1530209c9816bb3f3bd95b0953096d825cce752ca
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10832 bytes
SHA-256: 8d645c84cecf57ac89c56671ba90b938191ba7f5d5368ca65e33a5f8e04e8f9a

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