Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22f1a885f1741f9…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 06:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 314c45039dc0c330eeba5b73774d4e04 SHA-1: 5545b2b3deb989cbd15c141e8778179a8b132725 SHA-256: a22f1a885f1741f9f8711974f3b0234f4dd56c11ece8f6a7cafd0a1d04950dae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristic firings strongly indicate that this document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=so+you+want+to+talk+about+race+study+guide+pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e38d79766---1318113071.pdf
    • http://lmyc.net/clients/875386/File/legidugokufodelivava.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0859f3b2ca---36004575910.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a907750dd5b---38086182997.pdf
    • https://datawire.gr/files/files/20886230647.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/708438ea872ec19037f1411a7fb30210/nimujarebifera.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/45928152322.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086549b6b297---losevebeferolovifix.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8ab2c38c3e747885b27726bb35afb1cb/xojajananoxoroje.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0abbd31c5bf2135267f609c723b62e22/voravebedikumakal.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/627503dc21ab699b814b42a893fa5d86/39754476821.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf2c0d9c3---67058719024.pdf
    • http://agendatourvietnam.com/hinhanh/file/zogexaginifefewenovuk.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uhcnskpvckqp3lq3pnma576j42/54940299962.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3ac10fd5b2830eb0156ff2a356855a49/28183142524.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e7b68208---vamemodob.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/gmnadhpag5t9jsd7kjrdvr1rlm/vetogulofawibuxatopubar.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874bf975789---6243858715.pdf
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/65627450582.pdf
    • http://beiks.info/public/file/46266430449.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/68961753444.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecda8590c9---xufitevubog.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a0908543---919936736.pdf
    • https://dienlanhbachkhoa.info/upload/files/92820478149.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/a67502e7e754ec175e820288fb33a046/31906776700.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010217.bin
8ce07fc3b472560444b14db547fc7aeeb921af85663402a03a163381a00a3d8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 11404 bytes
font_01_sfnt_off00011cc4.bin
86ea401010afda35445b8ee4a5c053e7dd7ce0e2d55fdbec135432304e8e5ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 17304 bytes
font_02_sfnt_off000149fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149FD 16792 bytes