Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49253efe2db8f08…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e62f68ed7a1d46a464a1f06955cda3d SHA-1: f926ad33bf8e636ae97eabe5c6db5becb80577d4 SHA-256: e49253efe2db8f087f4fbbc8acc41ce03b78f03a3aa560b780e4460d01e32c8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, pointing to a large number of embedded links. These links, such as http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362f99bcd1c---godegawarotu.pdf and http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ffce4252---luditib.pdf, are likely used to redirect users to phishing sites or download further malware. The presence of embedded URLs and the nature of the heuristics suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://max-metal.pl/gfx/file/78905361430.pdf In PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/31004573208.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/88258759502.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/65952531456.pdfIn PDF document text
    • http://belean.pl/userfiles/file/lejubivipelajakato.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vujogovas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ffce4252---luditib.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362f99bcd1c---godegawarotu.pdfPDF link annotation
    • http://duplisite.com/userfiles/file/bivexigures.pdfIn PDF document text
    • https://cmoretv.com/userfiles/48217433639.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/katepeju.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/wizawobesuzoritotavajox.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317f2e6c2f8---95455201954.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/15893559149.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sunidanibinid.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ae22f198---tulavidivi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jijilagojufugatinoso.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/35243251764.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/19977218879.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/64879649245.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/72353270106.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/varumif.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/sewufofosejuzamoga.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/jivonobijisutubevuruzanak.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/31935126525.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/77008015120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=latest+version+of+farmville+2+country+escapePDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 18028 bytes
SHA-256: 6f45d0b2697aef6034e14e3264f3e32f8e0be04e10a37c8d6c16478989b8bb51
font_01_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 11000 bytes
SHA-256: 8ee54301b62be20d6a70d9077a1751011264f05021b73eff3b93b9fc0c567a70

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