Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2774a5ceb375633…

MALICIOUS

PDF

85.7 KB Created: 2021-08-22 05:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c14ad3a4faa6384d276dd25d8cb3388 SHA-1: 28be34e5c1e25d839c894331888ff350802e163e SHA-256: e2774a5ceb375633deec3edc08a52b85758ca2b8891076b5d8e1864bf8e65581
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially compromised CMS uploads suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://defaico.com/d/files/jesozinenudan.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e322ecd---vosakog.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/13213362165.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b4d1d7e9---zamabemutajavijagimujebo.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/jirinut.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831090ed2c---25799436700.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/pomulomexaposutupawusof.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/gipazixejutabaledigedi.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/26961176364.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620645345.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/82775543633.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vujadididakusuzi.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/majapujenevumo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/reludi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/5f08f980001ef740cf6541454a3c57bb/6576019573.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/18312267700.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/pibigugawum.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/88383055056.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/61049828afb2765afa18adcbb7de67e2/xubezowenegajenulelobex.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/galifazadibegajetizi.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xerotifuravepe.pdfIn PDF document text
    • https://ovalpolycoats.com/media/25519311634.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/28917199346.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160893de8e8660---95287007315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+pass+calculus+1+redditPDF 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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 18172 bytes
SHA-256: 89838dc0e68f6d30561d133a6bd4ceebdc7beb15b0ca352d74f945ca0c889044
font_01_sfnt_off0001180a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180A 10632 bytes
SHA-256: cc76bb0df7e95ba6942fde24a3ddd8c4d547ea0e47d5fce959191defbc6ef91f
font_02_sfnt_off00013099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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