Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff1e628139b8db5…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 21:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86b98d6b4ea7ff264aa4a52f4e136a97 SHA-1: 7e77b9cb093536d812115436b67d1ccf08fb15f5 SHA-256: 6ff1e628139b8db5264130dcc0929e8f1657a7a6a73f95bd5e69415512a136b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and 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 nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=mobility+and+flexibility+program+pdf PDF link annotation
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb29584d1de---57151876019.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6o7kg984k3jv93ce4kvddlsdll/12360044381.pdfIn PDF document text
    • http://regmac.net/userfiles/files/82774487373.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf333a58890---ximenojulorenobiwotoj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/98907466907.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/12317927439.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/41166410476.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abd81fc9586---29832438444.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dcpk5rhp463s609sa3vajsl5ut/58713247398.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/zipibuxevarofimofenolasil.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/jukifijizafibudat.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/vibiwurepasenumudigezaka.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/rafotam.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9a90f0d1---34981841957.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/kitiperotamelarule.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607609db158f1---99317123923.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8373b59f---12963042471.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160743bde69cfc---jisedukigasipixolozud.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/82f5eb5712bacf03d27a0adc7d03b849/meseravukidavomobewejeber.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad6691fb9---77147173575.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_off0000d357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD357 11020 bytes
SHA-256: cbcf8b51e647caaea92552849326ccd73b072141daed2b124dcc7652e9502880
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16860 bytes
SHA-256: 01bee302935f0a07d7c720af2c098d66a7effa97c1b01ee29990c046985f6b26
font_02_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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