Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77144bbc46607b0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-03 01:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff7712a63519b30a78cabd3f98e41bbf SHA-1: f64919bb48d686f98e806e914238aa2e411becac SHA-256: d77144bbc46607b0faa92eb34509c116f73f471f3759b70381c40ed5edcf94ff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kirilmazbardak.com/userfiles/file/viwapawezuvevura.pdf In PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/8401879820.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/97557730821.pdfIn PDF document text
    • https://izr.fr/files/fofavusezidoza.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edb6698ae67---18156814542.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/32835724131.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210814024202193.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/db02e13ea51674a06a2082d7b72f99fa/53539215851.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bobufufu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/65568408471.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/1037825438.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/4r037msqvpt19c4n6205jud7r2/fexefetogezozorijesuz.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ac4t3rh68j7gperod4h59elj8i/10860956041.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8278e5773b2e79f4fa33d7717fd7bbc6/84937979404.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/i2bveps3q1dl7qpresc9cestf5/mekidurumagurikat.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///9251860465.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16262367213007.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607559b7c0322---tilanudajazizetaxilewepe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ad7a534dd---vefonorupujik.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/29ade94380bda4f0ef2721ba4bb41d6f/12777478709.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/lataboxaxavo.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/8599653690.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a488255b---77031187777.pdfIn PDF document text
    • https://kham.vn/userfiles/file/javanuzaluterugodag.pdfIn PDF document text
    • http://asfalon.com/__files/file/19029369658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=plano+bus+paris+pdfPDF 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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 10500 bytes
SHA-256: 77a4df4e07b8349faafc586ec3735db57d0ee0a3d9449abcdfe25926585af259
font_01_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 20428 bytes
SHA-256: 90f871f415386738344620bb2a92f9053e0e9494a98bf62eb2335a6d3936209d