Malicious PDF — malware analysis report

Static analysis result for SHA-256 30735b604278e295…

MALICIOUS

PDF

90.1 KB Created: 2021-09-18 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2e38ef3b7045e6ad3943639b3d8b8fda SHA-1: cb93606553bd7848822ba9505e3ef8f9323492ed SHA-256: 30735b604278e2953e086454847166c7619eeb218e36742e475c8e3f1e9f56da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=how+to+unlock+iphone+with+imei+number PDF link annotation
    • https://stallion-international.com/userfiles/file/65423795248.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/28007421473.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/piwelaruzenajilidigok.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/55993521438.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/31412284178.pdfIn PDF document text
    • http://fitviewer.com/files/file/63663716439.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/tijawe.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/48186762296.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/kitududopegalutadidi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427c5bcb9e3---32528174657.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wazevajokolonusobex.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/93168701454.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/jemonojadiwexiguga.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/99718249128.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/65448093809.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/91423285652.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/44316602938.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/zuruvokunexusimo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jbl25m8rbqidlhc4p1jd4kg0q0/javadofakobebew.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143be44bfc44---28738145386.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161350885bb3e1---31901883035.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/54856834107.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/90748853076.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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 19144 bytes
SHA-256: 18c5e956946a664d038ea5a8c70a3d1a766b01f3138d6ada4c536f9206ef228d
font_01_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 10720 bytes
SHA-256: 52eb82ffcd3dd4570caa74fa57719a9480f6ff155ad6a27fe5ba014dc3859c9a
font_02_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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