Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65a341a00aca754…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 20:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a6bb796e483ae286bec92a78c4614fc SHA-1: 33ed8955458102ecdefb9984027a7a08775ff9d0 SHA-256: a65a341a00aca754812cc9f8f211e07f484bedb0773f07494803de5607771300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://velomagazin.hu/UserFiles/file/74251917183.pdf In PDF document text
    • https://rzfmuhasebe.com/userfiles/file/65304065370.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/2952286501.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/bunafanopozez.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f7e1db3d---nerijupetazudolasujavaj.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/53724813600.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/zerofokana.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/loribupalogojorofojad.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/95689937461.pdfIn PDF document text
    • http://airfa.it/userfiles/file/15705835020.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82154018751.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/885adb5dfa2e9087982a4d40ed15beb4/xogakuwozowomadajit.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/luraluxe.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/4479177958.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/gejamazolefivanit.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/tebanujerujixew.pdfIn PDF document text
    • https://begili.com/uploads/image/files/mudunodozune.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cf29409d064d8771ad1112bd18137809/simexuwexuvaxixovatavelo.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/75618651077.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/62055614492.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/tafotisimubenewituvegozi.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/67888173174.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/bobakekagegelukitedozo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/wugumezegaxemez.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/41932718540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sims+freeplay+generatorPDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 19060 bytes
SHA-256: f4396973579896b795a5eee8d35eb999fbbf06f23a065447ffaadfb1ccfed41c
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 10888 bytes
SHA-256: a1ea3bd4a1a272c5a5f46d012c2f691b71a730ad79adfce4917065d970f0d8f3
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1