Malicious PDF — malware analysis report

Static analysis result for SHA-256 42692855cdb058a1…

MALICIOUS

PDF

68.2 KB Created: 2021-09-09 00:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ec160413375d6ffff71862a0efeb337 SHA-1: b169a75b8ce6a24e16d6f3daa9d3e3adc866a31e SHA-256: 42692855cdb058a14219ef2db87513436e8b35faeb96c591bc257642662c99e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the numerous external links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=kitty+last+stand PDF link annotation
    • https://grupo-kayros.com/userfiles/file/kesipe.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/87457493325.pdfIn PDF document text
    • https://dhesient.com/media/kivuwofe.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/tonuzidoziru.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2151fcdc8430579d53cc2d32d594e345/budiwir.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/8607785646.pdfIn PDF document text
    • http://p-energo.ru/content/file/7647828457.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/82140466521.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31731224509.pdfIn PDF document text
    • https://vpmemorial.net/images/file/jijavekejepiwafawisiwiwiw.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/ramexofevodukarazugukat.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/texaxokegiza.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/38311bcadcb0660a411f1eedd2ef7191/nulepajason.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/48303569674.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/39413251286.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/32570807589.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/wotutunutigogubeg.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/97412639856.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/44727871913.pdfIn PDF document text
    • http://trivio.it/userfiles/files/bagiguxuwa.pdfIn PDF document text
    • http://video-cycling.de/files/file/fugur.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ec8dd3674fd471e8b294a4ad3c95eb2a/fitejepuzuwibo.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/karijapomazore.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/10330300636.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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 9992 bytes
SHA-256: b51f21e0407ae2b57e73cd8268a472b6675175cb6f89727fcc9ea306650a7c5b
font_01_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 14724 bytes
SHA-256: 297ebd10314437643c81013749cd26b4886b32caf8505e0fe901fde16a69a666
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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