Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ebd8112e58897d…

MALICIOUS

PDF

90.9 KB Created: 2021-08-02 22:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4ffa34192734d2e8a9354025e3b126d SHA-1: a080a9b5719cf32a9ef8cf40980bf207ed5aecd4 SHA-256: 41ebd8112e58897d3abfbc7333ffcf8a020502ba35e454ee17b9e1aeb4ca57cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=miniature+dachshund+puppies+for+sale+san+francisco PDF link annotation
    • https://aadhaarretail.com/administrator/imagetemp/file/45022647106.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608a059502f8a---melumofi.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/gugevamuxom.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4ma7mhs0g8gr8hgm8sfq0fcr43/fusolagotovakejolobi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb42e4970---wulelizov.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae72bfe5a2b---9869837574.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc9005dbf---pudokolanalalivokamite.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/85907893127.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab7636459---26635872965.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/549800281344a4a7b328832bf384aad1/sizajarot.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/60843624719.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/27494556964.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd56b0ce757---37441284646.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/32590323126.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/22238183298.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/16128799007.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fccb07b6a0fa949d38e14edd30c3a289/retelepekujibeloduritur.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085482775a18---7038168932.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kivemakemupepunila.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/muwepi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a50720b353076d019b4534debf71b9b6/tonugufuzaxu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fabus.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f981f4e017---92498277091.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4e02bfa70bdc388647f6bd57db3c4c7f/babewaweg.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/16111343690.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/94828336259.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_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10812 bytes
SHA-256: 09c22bdf9fc1dcb121ebb7f4264ff3c0583951f3345b1ebfd0d8c840517fc268
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 17872 bytes
SHA-256: 30472006a64c2672fcc0eaf7b7d24c2ba8bb8936b4206fbda777034a8bb6c49e
font_02_sfnt_off0001441b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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