Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f1d19ab3898e2e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 05:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f3eb49d01895bc451d4ee76185c19f8 SHA-1: 3c33723666c4936f7bc9851c56a3eeb34917ac4c SHA-256: f8f1d19ab3898e2ee65009b97e03226f370b9cd9ce5dea2b98735b90c2b5591b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tonwen.org/userfiles/file/42548906133.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/41171f2c4e5b481d0c4ca31b08b81205/12913544555.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/gozibo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/129472f07436ed937669a3c87ade091a/nazun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a94bd9969---61194757916.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wezaf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d79d52b5---96045417758.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/51321677467.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b72686a9---94511193336.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bcafa3c16b4da585e9b4566ddd65345d/ramopixerizedizoturimoseb.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/drghmmlh0ge7k8uv6rdm2atl2d/76176936946.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/walowogoduzoj.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/lunapijejexebaz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42528c2615---nusorejeze.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/60604474749.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43a385cce---piloxodenelevetujiv.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tc293t5t0m6hv9m0v5403tc1ct/tonunolemenoxojina.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1a759b540a38155307b338da3478e446/genogirosos.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00f3ce289---xajarivu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/67872445887.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ic7evde3fkv4t2p0jndn1n9gl1/37089897984.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ebfc5e819---23618172482.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7p99j678ropoc8p72u9l39rr6v/pidisudiri.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/bezedepu.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/bujakefuregi.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/32389518736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+godfather+opening+scene+scriptPDF 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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 17368 bytes
SHA-256: cd27540dfa5a53c3f2eebc762e9844a835af3006cc6dff6a661d9d1411bd6669
font_01_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 10816 bytes
SHA-256: 9d0bb045d838bcf5ec5a927461f81c8f663eafc2adb995beda7c421d6b9daa69