Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba2ac159b2aa7b…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b700500df04bb5622495528c258871 SHA-1: 1d2b0ae6d69cc052ce527953709f4bf6231bede9 SHA-256: a4ba2ac159b2aa7b98d9707d28a25a62e57e4a7c83cb9d799e41473f5e0a4a23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=tight+chest+post+nasal+drip
    • http://127.0.0.1/kardelenemlak/upload/files/69771290141.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/309b3ad08344996199f11d8341edf457/94746284358.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6015aaad9d---sozurawaburorup.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/b341993580398bfba001447b51bbe7ab/32358348109.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/radawenerefikunajadafigop.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a08fc1054---givosabinirineborolowazo.pdf
    • https://edarky.net/data/file/zubajawolavigobodiwuvubi.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608473b1622a6---55779586604.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609891f6c9c5e---16585785159.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae87846c1fc---wumebokodefifekukedipob.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca33018e61---30508376290.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff146a13a0---56510608994.pdf
    • http://letdentalab.com/img/files/26310925475.pdf
    • http://usaoxin.com/userfiles/2021-5/file/44786511976.pdf
    • http://vitanova-cattery.com/upload/file/98094313188.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/63688489920.pdf
    • http://megat.pl/uploaded/fck_files/file/92570455965.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/249bcc6796613bde153af4a014af0603/tuxokuliwuxi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973fda6694d---getosikimufofekudilu.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/60288822428.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec8bd133d---berarufam.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9510f7fdbad9a3d46177fa61037d0624/75103483342.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6bffb2ce5---84518738183.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_off0000ef1d.bin
933c3f0012873743eb663c75cda560164387b094d4b36f0aba5a0c2cd3f0cdad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 17396 bytes
font_01_sfnt_off00011c9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 16792 bytes
font_02_sfnt_off000134b5.bin
d42095457e850a1c5fa2b46108281ee747b3c093911007d341f3a9c92611ba89
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 10756 bytes