Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb6c7ab016e052a…

MALICIOUS

PDF

79.4 KB Created: 2021-08-16 02:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7bb10515d87196f13da6fb62debd0fd SHA-1: 2a023b2fdef13b9160341262c7db4b1beaeeaa36 SHA-256: feb6c7ab016e052af4e38bf3a76b2e46d5755daba93df70c96fea6dbb83d9910
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. One prominent URL, 'https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+download+coreldraw+x7+for+windows+10', attempts to lure users with a fake software download offer. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e86b9d12d8e64ac19cfacd7d9cac34ae/72348601305.pdf In PDF document text
    • https://fruzsiflame.hu/userfiles/file/48695796632.pdfIn PDF document text
    • https://baglab.pl/galeria/file/96907613622.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a4ab8567---96272460148.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/57d572f65de15259f4dea353039c8276/xukibetevowawedu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/08b06105699e3e12821a016d4e6b482a/14626576483.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210721_163139.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/49810489704.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160787a1faee09---jazofokinerelenusotogex.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ts8ga07t59mavtoq0r4uck4v80/48227502320.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36028797a---vuniwolibivakatosiwil.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/96439886916.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/64131969281.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/71047747809.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/36986586415.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/30283013334.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2e1b35052---ralalumojovefopimixe.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9bd883b0aa---dowalipugobolisokijarob.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/kevunuletogosugu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c198b2444---perozi.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80312772161.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2k930sebj9iod29uo6cqpib6m4/kegabixapepixalezomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+download+coreldraw+x7+for+windows+10PDF 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_off0000d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 10760 bytes
SHA-256: e34d78faff798fa23b235afe67bf47c2873bac1ad348835f909b105842322696
font_02_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 15960 bytes
SHA-256: 8a58e30ca2bd9cbc3ab9108c051ace4acb23f816271371936062acc6fe68994b

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