Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da136311111abba…

MALICIOUS

PDF

89.8 KB Created: 2021-06-30 21:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 06dc66b22c4e9b2c629538e802e059b2 SHA-1: 824d1e48b9df81428b71f431f5fb0572ac892c34 SHA-256: 6da136311111abba00e053cd392d542bf0e2e12c2ea89fe3f1c71d6ac4c3644c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://allytemp.ru/uplcv?utm_term=stand+in+awe+meaning PDF link annotation
    • https://clickkedai.com/userfiles/file/repowijijef.pdfIn PDF document text
    • http://distributoram.com/files/file/jitizel.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087b11671388---45840389756.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080691bd595a---peninaranolipinilem.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779622683d---zanosuja.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/10867732636.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/rizajotorubinulipeduwoz.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9617e8d38a3b2c5dbd029a1c44731113/38979037478.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5b4343d8---wezusukaw.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608270b48a3f4---tenoleralagafa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b594905245---gexifazunerum.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tl3flkldl12hvjcq6jrdsfcnp1/zusugusalinov.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t6c1eposreo9aji3jskn68uh1l/54491851171.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/rakoferikuj.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/rojugibilebipe.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6e9a3b96f918d9e5a02ee16aaecc3180/nibav.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tepuzere.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/81212938015.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160792878e306e---teterapoziwizax.pdfIn PDF document text
    • http://rilta.net/userfiles/files/76491198619.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829a6e90928---2316865102.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ddc0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDDC0 17344 bytes
SHA-256: 1834010ba467b2dacf4ce6628244ce91f9e825b123a3abe2480b00c26750bc69
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 19344 bytes
SHA-256: 9de0f73f40043700d496cd29da2b19ddc0f5cbd714f41ddb523c172b1ef8c88d
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001412e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412E 10320 bytes
SHA-256: 35482cb28e0e9c3c910def15a5f4695368165eac15ef1d06d900483e0c188bcf

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