Malicious PDF — malware analysis report

Static analysis result for SHA-256 d001a961cd13e478…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 04:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe1f9b14a8dbd2b24a7e513c46635480 SHA-1: b0e4bc5d224b85d127bc3896f76c134aaa9dce0e SHA-256: d001a961cd13e478f15b9115d8fa49a15e0ce14534e7d6a3f3227ba5edc59bf1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads, suggesting it's used to distribute further malicious content or phish users. The presence of numerous URLs on potentially disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://3qbuy.com/CKEdit/upload/files/2728183928.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f3e8903e---furapirowisetawijotixu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9524354f---95873066171.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/kedelusolupebev.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/20112405310.pdfIn PDF document text
    • https://unosms.us/userfiles/file/wabuxutuwusejatazumofatu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/d3d2s5bqvcnot8bg317guoucfp/mozosogijurez.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/varodedejota.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pagunadimipexesabavoboli.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac28bce0a---zibonowidot.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3d7e1077c20f6f245e64e479b9966d23/rafaxotabuwabi.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/dazorokakibojumap.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/shiv9nn0hqqpjklgk1a1jib176/55074171292.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/20817531833.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160812eae3c524---95119091999.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160f6259b7bc74---defomipugavom.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae3f6626b7---jikurofusowozefov.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/61276716526.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096df3b6343f---mejemafemawote.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/sapedugategupug.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/jajomekofu.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kemekasusilafo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/594abb5acbe3e41818fb9168b5227b22/56456041168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=french+verb+worksheets+avoir+etrePDF 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_off0000be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 10640 bytes
SHA-256: f0dfc815546df83ecf514e8c973287943ac0633ebf0a2fc1a23db9f8e782cbe7
font_01_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17592 bytes
SHA-256: 1ea30fcbd3c7e005bf776b51c3d53a421b1a716c51e2d7768d6602a41a97fbab
font_02_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1