Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2787c55de6f024…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 10:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65c8d69d8c5614bd2c9d9560d55c6a41 SHA-1: 98d1c4abbaa918b88a764946e0f86febd863b802 SHA-256: 5b2787c55de6f024f61d069a6d15419e5557bb51ed1fe3fa5889e9a907f471e9
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting it's not meant for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://washchienluoc.com/upload/file/vejanikamagobowevol.pdf In PDF document text
    • http://aweibel.com/Photo/file/65981385288.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/17936309285.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/10163023963.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea34bc3ac---fezuvotatibezozatulet.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/21111031177.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609785e5e3011---7533007461.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/5763791215.pdfIn PDF document text
    • https://eubeer.vn/uploads/files/pojejigilujozogixeri.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/59373845644.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tixorafurumado.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/xojesunetuwemokujo.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sudutojided.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210816204856.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/8j4gr89lnusj9e2d3eafvusgd6/23742382439.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kilemi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/7797245582.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bdgc403f2dpgbj40oqv4t9redo/julubotunanejeronana.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tcnt4amjs6sahnae7i2alai7lu/98268604159.pdfIn PDF document text
    • https://asiajitu.com/contents//files/78316708269.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/73860553836.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/wafomawonanapegogezekos.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c787d257fac---natobovuweluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pisces+health+this+monthPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16508 bytes
SHA-256: 30e8df376615601c1ea642801bb089d23facb1f9897d226130fd70958d1a5a28
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 10396 bytes
SHA-256: 016b477bb5626e659180461bc398327af9c4b85dbf28cf07f4309827ad4cae2d
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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