Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f5c3ec3a7bfb0b…

MALICIOUS

PDF

107.4 KB Created: 2021-06-25 21:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc2b3f8bbc43a84a89d565259395739 SHA-1: eff212eca729b23a7ab4f8b5c10ab34860c9ea99 SHA-256: e9f5c3ec3a7bfb0b833d9e38285d631794ad84dc4dbe829ed2f4283873c99d79
156 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 compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, as evidenced by the ClamAV detection and ML classifier flagging it as malicious. The presence of multiple distinct hosts and link farms reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • 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 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://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/79246285295.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b208c1ed---bazivogev.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/tfe8arv83bt6ckigk9gd0ml4r7/92780034154.pdf
    • http://nagymester.com/userfiles/file/ralimaliremo.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608894a05e922---91929580754.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/oo1gmknj57bdf9lcj9m7qbcmj4/66960612501.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038ab2a73a---wuvosupidexaroxefitujam.pdf
    • http://ks4073.com/file_media/file_image/file/98562136176.pdf
    • http://originalcheck.it/public/img_admin/file///xasawokazuduwadi.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/31d72q0re943b5en9kfs75dqv1/87716181521.pdf
    • http://progfin.pl/userfiles/file/83133218208.pdf
    • https://dacinsara.ro/fckfiles/file/nojulujajibidu.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909bb328100---51156530430.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608538a88efa4---fanonibatobuxuke.pdf
    • http://amirafouad.com/uploaded_files/file/64887814165.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b899554e---19218550921.pdf
    • https://acrgroup.nl/userfiles/file/ralonovumiwotufilo.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/59428241255.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077829df0c12---72690278120.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/k12io22374eaeepd6m7fqs0fvo/datexawivegatasa.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3c32fc867530539b8fe08ee24d5ba1fb/8421502086.pdf
    • https://suprizpin.com/calisma2/files/uploads/giwupovewi.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5e7861f2d49a30b2bf73e446128ce58b/xepuz.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dd55b64---85541321768.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rom+action+anime
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141c8.bin
dfb4ab64ea36f3448e346bfbac4f702b8961c14574b44c94967afb369c7e607d
pdf-font-stream PDF embedded font (sfnt) at offset 0x141C8 17872 bytes
font_01_sfnt_off00017066.bin
c71064396c475b65201bc6c3471b3d8dcbe0fc0f347b6a20d131242da2585d08
pdf-font-stream PDF embedded font (sfnt) at offset 0x17066 10120 bytes
font_02_sfnt_off00018706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18706 16792 bytes