Malicious PDF — malware analysis report

Static analysis result for SHA-256 682413ff0a7fc1aa…

MALICIOUS

PDF

73.0 KB Created: 2021-08-27 23:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7fd6b3fe1310d9c7e39def53df9bbe34 SHA-1: f0ce6eb46b13ce383725b7228544b13d89fab90e SHA-256: 682413ff0a7fc1aa29c96207aa15200230658bb07c380ae0dc52a0248a676313
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to redirect users to malicious or phishing sites, a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e3229972---94387429724.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/15907030366.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tabid.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/64387765535.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e7dadc2ddf68bb5bac5a31cdcbed019e/27510844917.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/waluxifazavefukulew.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/ravijoxutewijabiz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9a41577a66470f662ccfe96168d950ce/73988753883.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d51c9d13a6cd16288e33987f4b0601ae/11657721894.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/tarafipirupimekapudivate.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/81632179480.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/61708931417.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/33368801625.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf232b1eb---wawajidexelozutof.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e456bf753---5276494226.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/47770032569.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a2bf413f---5345360341.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/08a3acaf82675b43c98928766a929493/37786568405.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/53594234007.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/majivisepuwinogujefelusu.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/14b01d941ffd65ee4be0db9d375c4a42/16717479606.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae504dd664a---fivukilomavozo.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/10336871699.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/gufozomuzurese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=would+you+rather+good+onesPDF 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_off0000c048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC048 14600 bytes
SHA-256: 6220ea254fd1353bcfec158de9cd8acc64048c520e9c1c170482b090ee4cef2f
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10644 bytes
SHA-256: b91ab08c2b8e32161cdd5b63b80f34e1dc52af608f9dca21f1b3c81c565a7b40

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