Malicious PDF — malware analysis report

Static analysis result for SHA-256 957df6523638869c…

MALICIOUS

PDF

87.1 KB Created: 2021-07-15 23:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec2797048b34bbdaf86e34ba6926ad33 SHA-1: d59df0852c56c03bcdb34aa188e8d55fa02904ef SHA-256: 957df6523638869c3e940410b3cf4a8e2e41b6485c1197ed7a8fc9d46d99701a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm on disposable hosting. These links likely serve as lures to phishing pages or sites distributing further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://press-centr.com/images/file/23077656987.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/76c1c0c8088d69e52640c13dc36c8ae3/magudarowovuxavofavar.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/podifoxosumas.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/28646296017.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/kadosuwudujesutewidos.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/fajigetijudulibutem.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160925b72319c9---pimewimimemuvuwukine.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/zuvulokefokokelaviwunog.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c713380743---63888944250.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d078ae442b---17383501392.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/26/file/20210526_063615_168.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/38696613125.pdfIn PDF document text
    • http://guitarenko.fr/img/files/68852740161.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/054952903de94f1aec7975d69e02526a/kasajotuwew.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tororurama.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b94cdf1c---26369633618.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160754393d8cc3---37189227838.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/70495475856.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3c64dc1a---ranegediti.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/butujunab.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/65787399106.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f887b44bbc543a1024dd227c506ffd5/raluweditubobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sermon+on+anointing+for+a+new+beginningPDF 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_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 10644 bytes
SHA-256: b730607d262edc22dafd7e97c836d6d164b81f0cf49ab354ff093fd5236ae1d9
font_02_sfnt_off00012493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12493 16472 bytes
SHA-256: a0aa653ac879d7228f161d7c6749e767c5f7b95f00a39265534c5f69cccaa773

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