Malicious PDF — malware analysis report

Static analysis result for SHA-256 55af049dcc253ed0…

MALICIOUS

PDF

78.3 KB Created: 2021-08-21 07:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 692abc53189ba7e10656a20e696effc3 SHA-1: 300d4f615ecda2410c353b69999c8de804d91e0a SHA-256: 55af049dcc253ed0d727343440862f5a44ca804c52ead0ac176c7c77494470ce
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics strongly suggest this PDF acts as a lure, likely for phishing or to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://medvor.ru/uplcv?utm_term=causes+of+the+civil+war+webquest+answer+key+pdf PDF link annotation
    • http://tatnhapkhau.com/ckfinder/userfiles/files/batokoxudoliboxigog.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b73d2dbce3---gikenomevur.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/1afeg340sgpnaq94h3rh0c9kn7/xilog.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/losimegu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff6f75898---63621976343.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/11050254229.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/fuwodasizixor.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/36714296233.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/norikekisobuxivugunuvi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160792f79d434d---kokolutusaparorekobuvepe.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/pobijunebomulaliwogube.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083598218ad7---mekimigow.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/89986880329.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/4356487736.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/77568167012.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/434a5d87673bb0d9a2ebd5199afc2b96/23618595237.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d233335b837707d73a295cb7d7478860/33736983739.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/kenufunogubugenod.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/72454918274.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/16473563833.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/lebajagaxotudesezuve.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1fe44343817c3ea7e1fe6e25fb11338e/gazafidot.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079014951d03---67465673895.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5hbrvprn995lh7rfjjsiifih9f/34393586618.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_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 11492 bytes
SHA-256: 7c5329c9594d62df5137c1ffa1c354e9e764e639a1912af3695bd56bad760781
font_01_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16084 bytes
SHA-256: ea7835a9e689080a022295361141bc0751494386a9d454caf7e2d40affbdcd52
font_02_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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