Malicious PDF — malware analysis report

Static analysis result for SHA-256 9622689bcb5a07ea…

MALICIOUS

PDF

120.2 KB Created: 2021-09-06 09:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6b2b84cf8543fb2009cab8df247782f SHA-1: 22be17f693e584c5e7d3aa4dacb388a2440bbb24 SHA-256: 9622689bcb5a07ea68a78e2f2121bb1e2cd8014bef034e8d24a98a5964ed7091
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baschin-heizung.com/meineBilderAlbertGrundschule/file/demiduxu.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b1813d28a7be363886b724f50da14872/bexafasiwekowerukom.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/56043029731.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d437432757---61218766633.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810e2f1ca4---teparija.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf6b26b18---86454758690.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/49810779100.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/71052736796.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160709343e72fb---bewabotapajiwatejum.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8cf4b2965de0df9ee9c01438f0289e28/sedepudupowovedivutuv.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/sufikupasetumivusesum.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/shd07o8aooatd39o9ilguaqgm4/kupabuxokebepi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xoduvunijozujiwulonu.pdfIn PDF document text
    • http://quinta.cl/upload/files/65386270475.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab897e0ade9---bedapasepufifuzam.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/8cdqag1n0u61bso9aahchmucig/kusiguzizetaloji.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/tuleletolibor.pdfIn PDF document text
    • http://yepuco.com/uploads/files/dowemipetifix.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/33381719537.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/wuvidubapejudosetena.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/ludidajim.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/90077675741.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff05b8aa99---20622899369.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0134cc4b10---17543865016.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2aeec649---41296173789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tuberculosis+miliar+pediatria+pdfPDF 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_off00016e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E19 10880 bytes
SHA-256: 61a1d95af520295ce2dcdf483ae31a546285bdd4bbb2a0e3800370afa632ad34
font_01_sfnt_off0001870a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1870A 20456 bytes
SHA-256: 9857a37420bd9c6cd8c95472c6f026224f7cb49383ac2cd2086f226340bdedfb
font_02_sfnt_off0001ba90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1