Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4e76819d3c7404…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 09:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7273d751472ad1b1ec89bccf08854da SHA-1: a9985a1553132776a1e3e1ef6b2e1d96633a4d78 SHA-256: fa4e76819d3c7404d9ded2d28e640b4c529c09f77c5f0548c061b329d1fa50ee
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest the PDF contains a link farm and a callback phishing lure, aiming to trick users into calling a fraudulent number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, potentially leveraging exploits for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://master.plus/wp-content/plugins/super-forms/uploads/php/files/0d8271694e808b0e3084edcb4893e268/20300103508.pdf In PDF document text
    • http://kraski-chernila.ru/resources/file/50864870868.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/sigopawilu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f68f8b18797bde52f45ec4d7f0c5da35/91820663354.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/zavurip.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b926ea61---letudarelurozasexusese.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/77731724795.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609869745db1e---bazuzegukor.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266d34997fc---fuvawudebikoparikuravoro.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75640480589.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/29895998783.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///67052380897.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/45278628673.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/20287556182.pdfIn PDF document text
    • https://edgecs.com/documents/kirevugujoxejakaku.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/26682737701.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1p1e4phku6psp0mq0vcn36ohq5/xofowiwotafilabodazirobat.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/vobudusolomipivuvudi.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/8663255186.pdfIn PDF document text
    • http://calisnt.com/uploads/files/dazonumupusowawamu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a05ad01fc---85731785581.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9068887998db05a4eee1dc0999e58deb/xewukelalunorawufugisa.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210520054151.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/00d581d8ee21d1468ca77b1191cbf121/23982370470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=extract+text+from+pdf+file+to+excel+using+vba+codePDF 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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 18332 bytes
SHA-256: 2cfe994224ae15cc5b91ee8bf29dbc80ea86033c241cc0b4d9c9734ceeaf756c
font_01_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 11356 bytes
SHA-256: 75ce6dd93bd5186354136f34137ab7d744bac9574b46de97f499a1ddd3d92265

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