Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f95b88c7d2ffb4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 20:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3673dac08bf5c43543d9f999c7f8d15a SHA-1: beea3c262c1eda63d0daf5a04dc71f75c2c13407 SHA-256: 49f95b88c7d2ffb40c1163644b04781e075d6584898e28190cd122b4c268b65f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and ClamAV detection further indicates malicious intent, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=gps+download+for+android PDF link annotation
    • http://heatexchangersolution.com/upload_fck/file/2021-9-10/20210910042824431420.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kadedakemafuruboropof.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109161604437862.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/sapifamedopoduvozafaxejos.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/77786108036.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bitepomedawigefupalinokux.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/91854615731.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/15c04489a4c6b953eaecd6ea942ae5af/rajepaj.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/jaribiwupuwip.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/23485201.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/ledivebepoki.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/4606451586.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/fujeruniwevazagigasaf.pdfIn PDF document text
    • https://grouptm2.com/contents/files/42614838636.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/fofifufutuzelopo.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5512844992b4c40d043fc458fcb90f69/kajukixejog.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/dexagagamuwu.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/zavisaro.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/rotazivetana.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/gavuwiwigewanax.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/dagatosubotalof.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144976236e40---bonag.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/dadobakawezatugeduzuxe.pdfIn PDF document text
    • https://jurad.eu/files/file/loxeretinil.pdfIn PDF document text
    • 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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 10388 bytes
SHA-256: aee37ed18a04f8cc508e6c77217182849e39eb986913013897fe77037d00bd7d
font_01_sfnt_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 14196 bytes
SHA-256: 95af8b3b436c20f52947a1872031ee168933441a0c89ee86b5d030794ce03ea7
font_02_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1