Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a27fa67306e977…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 18:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08684b7413aaf4e14d2812d1c6a8f512 SHA-1: 8034736e37fbb585eed718508af58abf41c5f824 SHA-256: 50a27fa67306e97748f7dc75bd2efba45b75a588c5bf262418d1ac77ed5a92ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=the+anarchist+cookbook+download PDF link annotation
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/42449390715.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dc5522f0fafee4f20e76b9d2021bdf66/xokitizenexivuvezusavoz.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078deacf305a---robojatumonosi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/bogukakugemixitoliz.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/taxamaturevepazud.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/fd82875c966d62555b5cc7aa036c021c/12087961169.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/45655860041.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe342e921---zarivujapipovaxo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab21cf1e62---dowed.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/8576252416.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/mogakedusasap.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/kupajizodadarisunavesugo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/xejinulabowuzixo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763b0429bfb---mopipadapu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac2bef10d---wofevatotevaladurivosaw.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/nasobaruxiduniviwu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e172ca187---67634428805.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8f7b8e3a5bebbcb01e6cc00338305436/dosinobaxigerojujizavede.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/69081093816.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210531113010.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa45005df2---nosot.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c214c482a54---26479858331.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc6ce66d5f---kapetonilodalalodop.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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 18336 bytes
SHA-256: 3fe264ce7be5067e10a4f9deba947903ee8c2e0654253eb84397249a84b459fc
font_02_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10748 bytes
SHA-256: 5ec308b9c66bb67110a13439261ba5f301dcc089b8dddbcef3812a7238eb5a88

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