Malicious PDF — malware analysis report

Static analysis result for SHA-256 973c57e9327522d3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 12:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b6c157ee723b55f7cdaae37ac70ef8e3 SHA-1: 958f602b70c01e77a75b1dbff40013492788e91c SHA-256: 973c57e9327522d3ab06ab4957c448614347ce1bb6590a5d8385e5202735c1b9
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to external resources. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is likely used for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5ee1eb9cd514abbeb9ccb6af811c4e7a/45170334076.pdf In PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a742e62a33dbd83ca9b5f75b9bf1f077/pasigasoxiravowobudag.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210625015654171.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/wopigufelodavasewinikafu.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/xekulipuxiw.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/54289472271.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/9ea517bc3285435cfba6d692c85367ad/93139751850.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1a1f995154385d73f20a7b575845b2e4/japavukevigusukogi.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c50c5fb38---jekarajudejimegedulu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///makif.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94424113530.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7c9314ab---29596589178.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/32854875068.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/piwotososof.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ea759593b5234c4b8e4c7e8837754935/39577077935.pdfIn PDF document text
    • http://vce34.ru/attachments/file/63245941761.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/24749394431.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/eba6188bb331c1625ded3ba7c5f5baf2/betavujuposo.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/depobigubigub.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8a3f116db---wekulikevarimanitane.pdfIn PDF document text
    • http://farashimirooz.com/files/95539583092.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/19f705c434729a044a75792793704cf7/putepabukokuluxabepazo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5in5k3niao3gehn43dq61ph5n4/sumatuvezanafekato.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097fd5eaf1f9---64038746541.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/ledasoti.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3a0efe6f---22715672845.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1f0e36ee---46429010981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+lagu+she%27s+gone+mp3+stafabandPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 2160 bytes
SHA-256: 321e5a561109116656b3bb10cee7bc2ad31a0c2c6ffe235d16c5a89344511375
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 19844 bytes
SHA-256: d727d29eae8aa259176e35d96c33465183e13d6eb05c04c81973ae3758c2d75b
font_02_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 11284 bytes
SHA-256: 63e6986d505d6fedc24ea53d423741ff0aa1703e56f937603825b2308f245073

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