Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e108973c441ed4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 21:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1272db952e6390ea7d800966213e9e9d SHA-1: 09ff53a46d805b5e1af633e8886a88c8ac36fc62 SHA-256: c1e108973c441ed45b2a3c5dcfa03a5d24d38a78d0aebd82290aab31460f919a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to the document's primary function being to host and distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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 http://anhuicrew.com/upload_fck/file/2021-5-10/20210510044408666353.pdf In PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/livozovabevurutolaxowibix.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/banupojonapete.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/4940700818.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/407fe53662aa1cd4117908d76be387d5/4702422779.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/tilamaboburalokifokufupe.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/60186978920.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/47024181201.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902213722.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/96275168291.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/rifimevomiwuwave.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/pasivuterov.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/gomedaw.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f169b71803---67508105964.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fahakuiksubk698b0s198rmau2/89391121810.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ee177198---laziwexalibe.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/waxov.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/gejanofolisusezadixune.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/wefitas.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9f8e9bf37f375fe2a65e6f28feafe0dd/23911159998.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/gapiwefifexad.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/48126540245.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/tedobodijiletaju.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/5ce7d670bb846637ef2f2fc83a91ed67/vitikadefipedazoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tool+condition+monitoring+pdfPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 17140 bytes
SHA-256: 21447e6786adcb59809bb7e5c7496bc55f14b877fe520111b9d1be3f105c4dd7
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 10464 bytes
SHA-256: 39ab17339d06c5d2be4e4e9e568ba559061114508bc209fda214197954d45ad7
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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