Malicious PDF — malware analysis report

Static analysis result for SHA-256 8294b5ba56a1410f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 14:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b931969f31b8b0b63710e2db5b11a58f SHA-1: fbf536f8c5d4f36d1eb11fa5f2de826ca46baccf SHA-256: 8294b5ba56a1410f2b145813ea4564f1883819b462cdd67fd0ea4bebc91ec1b6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, hosting numerous PDF files on compromised CMS upload directories and disposable hosting. The embedded URLs, while some are marked benign, point to a pattern of hosting malicious content on potentially compromised or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nayyaralidada.net/alpha/ckfinder/userfiles/files/nekikerimivovogoju.pdf In PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/noxogizatekelakemekufora.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/14200757255.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/tovurozowuwaralu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tozivetivubufe.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/52428190554.pdfIn PDF document text
    • http://feminella.ro/upload/fck/dobukibodunefifutine.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/655f9cf891ce01400a47ff272c5413b0/82239471665.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/32361285846.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f46410ad94---ditowebit.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516b155fc6---bokitalumepaz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kizupomorob.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/doviworaxotig.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zabuvit.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210911030732_821684301.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dufelibosibajoxisetejibi.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090404303773499.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/magivax.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/98732902204.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4205749e---fopivalujuvazara.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/35295010407.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/gurusabem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+longest+yard+123PDF 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_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 17292 bytes
SHA-256: ed873772768aa5bf082382daba572e4f0594115c3aa47dbe3099553086f02889
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10856 bytes
SHA-256: 103d94eb2d2a417d14b767326a00e3def35c51603fde98a2f9b463896993af4d
font_02_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1