Malicious PDF — malware analysis report

Static analysis result for SHA-256 af822e5c7205a372…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 04:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fda9ccdf8158db98a5764e13f9ddd58 SHA-1: 1ead3de0b2d594ed79453187d7aae90192f9e0c7 SHA-256: af822e5c7205a3724d4e1c82aaebef94367c98850d92b0fc96aa201b4f2a9521
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple links on potentially compromised CMS upload storage suggests an attempt to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://bacvietexpress.com/upload/userfiles/files/73653083788.pdf In PDF document text
    • https://all-new-wow.com/upload/files/91523637309.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/46867f35332f64c6eb5695c1248ea442/73505231334.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e56056db---62275000143.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/57104343794.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/puxozutipojuvu.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/tomesegadugamalekix.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f3ce38b20a26917c62109287375a398a/96872045739.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/a74dpktdqd0s464bo419uhg3a7/bakogofoxizomukivut.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/69358885220.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/62119887180.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/55251225072.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/gevojifebumofosidedi.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ajjl9mqdk7lat23vl7f77voo0j/sewagerawow.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8bd665b0---zeruwa.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c4fd10e5800101e95768db03c92d0a21/mikuriratuduwonemusi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a71582a8c24873b1960c44f0591fb74f/44654252034.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/31648305513.pdfIn PDF document text
    • http://homeopathyhk.com/files/rofik.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5dba9fb3---gikat.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/5314462303.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/509fc98379d34c0a08aecd83653a4a3e/92567292764.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608755da3d774---11393866119.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/88194d638196196c2839188672dfb637/dikogupawimuzadimeko.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/gesidefawomiwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=phylogenetic+tree+of+trees+answer+keyPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 17148 bytes
SHA-256: ac69159ebc3fc37dc210e6b7f9a33dde3649d5f251f08df1638f3de7a279cddb
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 10908 bytes
SHA-256: 7cf224bcd65796bbb418e0de59351e69c15e146f907d6a3b8fb6d424859094de

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