Malicious PDF — malware analysis report

Static analysis result for SHA-256 08783f655d1179c2…

MALICIOUS

PDF

85.1 KB Created: 2021-07-31 02:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e0c15a0dbc9f518b24a7ce608ae0bf5 SHA-1: 7e7243d4549feef3565e53a1939b5a4866d5376a SHA-256: 08783f655d1179c21ebfabd331ad14912306129e2586e469f6f0bffba49dc9ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://freebcard.com/ckfinder/userfiles/files/bexirudosa.pdf
    • http://ibb-online.ru/f/file/jujip.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef6c49b0a---44109190502.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a281410a835---sezuzizonozavumib.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/811ae67d92f4f20bc08a0ec5a01eb3d1/916981520.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/649ae024abd1412739b10306eacb5db7/gavuli.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a86dcd1f7---fuzuniwijuzegodubakarug.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c2feec1abba---7665503732.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb79ded6df---85253687558.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/48268289488.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce08a558a8---7472313537.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1ea5ffcbffe6dfa94db4bcb9dab56b7a/28923668009.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/mutixores.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/vairg3j1rcr9re7ugd83ncnfek/72116517794.pdf
    • http://csc0851.com/userfiles/file/20210618183224_l9d6h3.pdf
    • http://mastrodibaglio.it/userfiles/files/kadoparukadewegu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f084aeec5---timilagaduwavuxuzojix.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6185d274439e063e9527f09731f44f52/22815591318.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/wabozukoxosokobokuge.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ff91cee62349e65ddcb5fc136d8f4ad2/84492608936.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acd2a19c4---koxirupeba.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/cf7475c106722bab3855e80f3f4cc575/72875808508.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/44284984487fea5f37c417e8c14e614b/zasapijupipupasotov.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ljsac1hiacaotin13fm3q8ip0/51855687942.pdf
    • https://argumentua.com/i/file/70641492554.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mysql+for+excel+free+download
    • 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_off0000ea02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 16792 bytes
font_01_sfnt_off00010214.bin
e0be04c30a4e6b410b3433ae01f688bc5ebfc272db5a150a5cb5d5164a6d11bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 17004 bytes
font_02_sfnt_off00012e47.bin
56d1c34861c996d5c95b818498b2ee17f250ebd91734a83ac6fdfac66b76d4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 10720 bytes