Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5ac676fca8e829…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 10:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de62ffbc0b7052025659f05ea10cf25d SHA-1: 3fec63c90aefe7923620791adeff2b867513f4df SHA-256: fb5ac676fca8e82993b8d387feea86702fbaa9e98d4c3131d636ce14efd00871
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 executing malicious code. It also features a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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 http://norrlandet.se/userfiles/file/42320860601.pdf In PDF document text
    • http://cudicio.it/images/file/vopoxalurituwuvubemiji.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/87644e2b9d984811cd80128b2a72fe1b/42851549789.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/571718330.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a91cb262f55---10257134351.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9b09895a74f471a61fddd7dfdd06dfb8/ropizumorugasopiwatupamer.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/jisexawef.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xudofolirejojereje.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/53486222116.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129346040958---jesaliwa.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/rrsa4ctul71v3n6040u1lhtr2d/nalenafumasegojefifupur.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/22352673621.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/sufijojiranamunapetoniniw.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/rufixepivoxil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/41c5acc52a7615a93152689bb11445ee/4345209848.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/91442115244.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/miregeguja.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/92744441021.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/73398316367.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/abde4eaef443b0b8176b1c8cd8c890f2/91962066430.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967416b31ea---92900895490.pdfIn PDF document text
    • http://envigest.cz/upload/file/xalipesuranabopisavura.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/242cda3f6daaaba7ec70907e4570da03/ganube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sungai+citarum+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 22344 bytes
SHA-256: 6ac41b7e1a8e4e1956fd971313f9bd374a75e749286dd397541e82f48172ca4b
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 10672 bytes
SHA-256: 1605d62f7e79abe5044b312d334b83261ec2fc37d53d23a45cd24ac82a03ec73
font_02_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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