Malicious PDF — malware analysis report

Static analysis result for SHA-256 e125184c765c92f1…

MALICIOUS

PDF

95.2 KB Created: 2021-08-10 18:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba11711b1f4e7e75f0631ea13f57ad20 SHA-1: 9db03169afbcf3cee42c7503fc4a2096883ce15c SHA-256: e125184c765c92f132f9a111626109a7de1ab95d5062865b282648d7bc791aca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xn--o79av69abka850ab6c.com/upload/file/202107122308441056.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16096b86a31df6---feritarikisadazorutu.pdfPDF link annotation
    • https://jamuiboe.com/webroot/upload_media/tibezudelidasixenifilubas.pdfIn PDF document text
    • https://e-midas.ro/files/file/78810904828.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/suzikabanozulunutiwa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2a858176b7f6c9ddbca0a6fb7c30c509/zuwifikivifonavakisizel.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/fegomojozesifiwa.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/67132605061.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/fefubiluzo.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/reperavuzuzedategujitatu.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/70680553097.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7941e873---vimitugobowiboxolujibe.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/22023417043.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/72597616769.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/c4v8j4sc57o4dphutp1tistq4h/wituritevepikes.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/43996744388.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/22901248314.pdfIn PDF document text
    • http://huiking.cn/uploads/file/240613438571.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a287c9a102b---lifoxojukemil.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/2ucdon2diptfm4ia915n6bmvha/92392448350.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/xiniwomizavekulusa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae57fee2939---wabakuvovukofujiwamojop.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9361d07ce4---minizimoxejisoj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c8fa57f0---vudoripujepivusegobak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vorstellungsgespr%C3%A4ch+fragen+antworten+st%C3%A4rken+schw%C3%A4chen+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16120 bytes
SHA-256: dfd8d1a6d2db405044199fc7a68692d09b94ae0dd124306a143b91faa13a9a4e
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 18044 bytes
SHA-256: 170af4281322843af603d159314380ebe899f829121fd0785ff9c31beb9416e7
font_03_sfnt_off00015074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15074 11308 bytes
SHA-256: bc88bb8cce2a04d5d27abdff5aa59a9d52474166424a7bcffc5e6bfa6c33bf53