Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b461ce68fb83133…

MALICIOUS

PDF

114.4 KB Created: 2021-06-30 08:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01ed18da8e98e19c549376099aa487ab SHA-1: bde3ed8464012d5d27c34f2baaadfc46a1a76219 SHA-256: 3b461ce68fb83133bbf61fd2f83f3f6d01dd12f23f75365154024f65541981e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

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://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/406au69ajoe8okvai9v0altfh3/zenasomowe.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6c0ed0d7a265cd62a24cf2bb082b5ee8/75393964449.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o599da4hfujf1bc9k3mejikvce/mufebamoto.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/12958306497.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6a18de2aa6f3926d9e51c169119083f3/xiluzosidejebibu.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10787ac20---972702347.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c719c22e5a3d075b3b8a341132a3fc84/83118435711.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908ca848f52---bovuranonuzewetivadirovi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5c207a015a052e04ddec033dbe323a26/4516837480.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/cca14340779aa7918fe574f8a23a0612/30471682696.pdfIn PDF document text
    • https://songhong.info/userfiles/file/46467742328.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/jabakiduzifikuxazo.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/jogolonuf.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5hn9nfsjhmgp8lcfek8mf2l6sc/dovepododasuxefegepibarij.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/vitiputi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f92b0a3545---zitikolimirutebifikaxasu.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/13258186686.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3c07555247e170cac01454b10d118c39/ronegevufuwatimovevur.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/45090402372.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/225209024608f9798d4694.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/gajijonerakamuwaxu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/tawufumutefegakom.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160963a2601892---92513254034.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/63075294104.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/2998755545.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/gasavejezefigu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nimivujuvaxu.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/lesaduzinorerova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nicolet+viking+quest+service+manualPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 18324 bytes
SHA-256: d8d699a5803048d5855cd517d516d598b9e8c89d467a25d2b4711c50f7f6bd1f
font_01_sfnt_off000172e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E1 10952 bytes
SHA-256: 030adc19ffab59a68b22114eba282481b6aec34c0f0093a5ca26ef154f08c82f
font_02_sfnt_off00018c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A418 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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