Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7d4112294b7b1e…

MALICIOUS

PDF

101.9 KB Created: 2021-07-06 23:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0fc62ee6438b641d6ce8656769eab45e SHA-1: f8e53049eb246a8128d85f55ad08c578b79cdf18 SHA-256: ab7d4112294b7b1e61316e66f24b5d0eb465e49fe8b8a072c1d75ebd60229a85
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to WordPress sites utilizing the Formcraft plugin, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1db4d56c---gusaluno.pdf In PDF document text
    • http://budohurtsa.pl/userfiles/file/moxivitinoniwulavosofuvo.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e5bb1982f5ca469f974d2750239b77c/ditusapiko.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/1584201686.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210527152650_1009950592.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lefatawofufopapolekusu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080513030b69---luraxonavugozeb.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/46890556418.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/68d1c343e7780a3f7a3cc52017373f29/kejedo.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xipelegiwopi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/46720027892.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/60812056641.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3fffe1151---19189485266.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/59fc36ccce1fb37106992e2409c89082/dizomefedomomanilokolotex.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7cd01165---15783032218.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2867a2616---nusegav.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bffc47983---39566354155.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcec1e607e---55543662602.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/gipow.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f3cd3acef---32923508509.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e1d5e80275e0ef133ade423819b57e3c/77007747770.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/35790529171.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kotapujotalerujeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sartorial+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016a26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16A26 18532 bytes
SHA-256: 4345b24e2cbdb390d8d0bf868de61a3a9050c34e08db8f1e6d7189c678e639ff
font_00_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 25748 bytes
SHA-256: 582ef09799e5a1784194bbc464951ff7f96a3334aa446bbfb9078aafa7416c4a
font_01_sfnt_off0001280b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14018 4952 bytes
SHA-256: 8e9a5c117cd5bb091f7685886c037b2c19947ef70761d4cb7fb46a87920fb11a
font_03_sfnt_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 10628 bytes
SHA-256: 14712d46618623768ef45a74c65276c7cdbaee74d1a0e03466ff5841bc46c752

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