Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1852f00633be76c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 11:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6be9c2bc57af9d4b286296838af6e24c SHA-1: 1baeac87b859c065a77673bffcf602fc1d8c01f5 SHA-256: d1852f00633be76c0cc56a59969b91e36e86d2a205e366c0253352942f41eea1
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware delivery. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=download+bloons+td+6+mod PDF link annotation
    • http://minhledtran.com/luutru/files/kutisaperaxipokukig.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89396771142.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210901_055905.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bfde09fd0---bukuxefisipigatigagumo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tovefovabemituv.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/74285565502.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/fevolikik.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/53877977786.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/64376252018.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/15992811108.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdfIn PDF document text
    • https://izometal.net/mm/file/16671072922.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/58500078811.pdfIn PDF document text
    • http://rinsacars.com/files/others/xikiwedake.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/35149201259.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd19e972de---negofujodemokurugobewep.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/sadiset.pdfIn PDF document text
    • https://kermanrooz.com/img/files/77681066954.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/turefu.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/59378442327.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/543c06254f7b52b41e33b76f1c87e864/nozozakax.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/53551638002.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/62962485954.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/dajuvijib.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/82290876322.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/pogoninava.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_off0000b536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 10480 bytes
SHA-256: d48ab311fe61c121e285c45d3469c3e9544f3c8e0fb66953a66b3a15837c05a4
font_01_sfnt_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 16504 bytes
SHA-256: c8b65939b07d56399b3bd170a5f9f7dc19c584dde043464de0d8027c2b801c36
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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