Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9826fe6e32d208…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 941ec4dbb44df62400489091052f1c65 SHA-1: 8d4854e2fc18fcf0f8873743c8bb845189bb4adb SHA-256: 5b9826fe6e32d208affa32a9143f1ee7bfe755ec172bb23f37182cf1c985d540
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=minecraft+optifine+manual+install PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1436c24b0---zegizewewa.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zuzoveruvexip.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/39187704736.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/50243374531.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/79688134002.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jedakoxeboba.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/1576433135.pdfIn PDF document text
    • http://ligneus.hu/upload/file/54065712255.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/petijemuridixa.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/91376899905.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092114211bd0---lotusegomusivetexuxarirak.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/64823971932.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074015e9d53a---foxexatiruwasawaxuza.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/nuvonigo.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/3492259136.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca2c068d1c---55478567288.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/mekejanifixerexiropud.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0pv4em3bpktf9pu5v9djuscfvh/motokojiba.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/33132334143.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/29056673278.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160702cbf881b4---93853718297.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1ce57504---dufir.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f06ad74b7---62150283636.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_off0000da2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2E 10732 bytes
SHA-256: 463e8ffd0da84a692a90b660ea1edb911941a364f5d0d809614168e333b9243a
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 19912 bytes
SHA-256: fa923a96d53cad1d369d19a91b03685f5732f1832563833bc87c5c835e461b4a
font_02_sfnt_off000125bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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