Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b0c94a4c536a8d…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 13:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 704d9a2d49fd728530e9b92aa793c31c SHA-1: fbccbf0530e957aab0ff8ec45e1af6c7a6d1582b SHA-256: a4b0c94a4c536a8d2bc409621da8fa050735ae9f806862560f448f899ea36e62
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. These links are likely used to redirect the user to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://infrive.ru/uplcv?utm_term=cramps+in+my+shins+at+night PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c99d6310dbd6febc973ce4ff1b5d1dec/7876400708.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/320dc1c610fe726daf5611d424ebbfef/devebizopukazonizederova.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/j196qt2kdtkhfvr0lf79h8phv3/79910449521.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/kojuw.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/73877200115.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/n08jpakao8nuadujcokl50jn3r/rosizifa.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89274214b8---70129173723.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/46926331944.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/tawomusesegenixuwig.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e546781025---dukinovawajomu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/oie75q6bgmjq7ctlno9491100k/jevixijematilamem.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7014bc60b---20290844727.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097b76e390f8---bababogevibitodemivebu.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numidopadisakitopum.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096190d68c3e---38001575370.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862bacce8fd---kixuvobofukutenajeliza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bd70ccea---ribajekabufoguxelib.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fesiwemewenozibidilisu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ve60id9g5fcu65hskua7i66qd1/86153685390.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5llmvu5h2t0av3lavk3nemcui7/88472908731.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bb0c66d15---27663827559.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/62de00fb72514fbf49280ad5bd3a6b1f/48014779998.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lefemijifagilusapev.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_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 17256 bytes
SHA-256: 5a87ff65353d186473c3a02abab65853e71b1296ee505b58f9a97f57fda61889
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10548 bytes
SHA-256: 77dd0fc0001919fe5a3601537d79a64bb310c7962b00e0333b58e20bf00a8a83
font_02_sfnt_off00013574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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