Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26b7f373f8e52c0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ece1841b59726cbf6af599e6abc61891 SHA-1: d26ee36a68e65e07a4500162c209e0d4ed83af52 SHA-256: a26b7f373f8e52c0ce7f5557938d2e3892902060f85b56742fcc7029aacf5601
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=block+chords+piano+pdf PDF link annotation
    • http://yule-sign.com/upload/editor/file/20210719144141.pdfIn PDF document text
    • http://asvpp.fr/pdf/77913874319.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f33257dc634f8ba8f7414ceced85cdc1/nuraxulogelipezunuzim.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/1004de3c905e26debede0345fe9151f3/fexipigabapepabajetus.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/tatobulogerewin.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/31234963011.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/9379639509.pdfIn PDF document text
    • http://imbirimbir.ru/files/zazida.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/73957685525.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fc42c03f6---49539766756.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/48915046953.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/040519293472.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9e333046---nijomufu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/25ec782c58c90d3dafe1f3a2829f3727/velavezoxobobalemifefe.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/99045603320.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027e7cc565---34401707431.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa56d5ffb---fugovukavuvowifa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/557209bd3ded9a63ddb6972c959c0c92/febodonebejilafanojunotu.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/54020416277.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/49216999419.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qv977ka0vr68ehapldqqaca6uh/53503899652.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1626238182.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b9707b9---50458638805.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0646dafc7---zaberewajususezokalo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/sawinuwifofavujek.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/sozaxakizigowinugurakiki.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10632 bytes
SHA-256: 65c3226bd1a2828718713b22b96949054bdda0e325b12cb1cbff497c3f4858f6
font_02_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 19836 bytes
SHA-256: 337e1f199f64a1dd8764e25f03316fb12033651c96c3e1cbf33d715e1b790000

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