Malicious PDF — malware analysis report

Static analysis result for SHA-256 a362a87f452cf862…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 06:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c409cac4f835f586e7052434c111787 SHA-1: e24b1631e58a441b77367d11e9a50f244ad85c91 SHA-256: a362a87f452cf86292094e9b23fb56a0ec4642804dc98d8b7874ac60e4f3bee8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' indicates the document may be designed to trick users into calling a number, a common tactic in tech-support scams or callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=weight+loss+plan+pdf PDF link annotation
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/48007153824.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sulirokikij.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/kurixononij.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/suzinadikusitefowuxelu.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/siduzaxo.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70929949157.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/damiserakatibawunavow.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf122d5890---kawaxakuvutaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0c9128a19bfdd5dcb0001274f5864fa9/49405151855.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zunibobadogojuvarusojakav.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/51388357852.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/86533317429.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/41074649346.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d4386d48---gupapareramomajewovejo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sutatopebavobus.pdfIn PDF document text
    • https://kede.org/userfiles/file/39782544141.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/58058083441.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nalujitinuz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/99690502558.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e5162622773---guxifelozuwexipomowej.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d0b8f4de441b754306d9baba5993f053/78193931903.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2ati9cl0b6afbua6j0o9grjl9/nefode.pdfIn PDF document text
    • http://airsoft1.ro/files/file/luturu.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/15528197207.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFB 10672 bytes
SHA-256: f1854de1a62f4f158cc8b276f8669d9c5d00e5ce62e49141d6702d5fa6fbc22a
font_01_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16228 bytes
SHA-256: 241bbe352549a894f764419b6e3e5c2edc56dda5cafebf492278a49c5004468d
font_02_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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