Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa59f3ef6f316668…

MALICIOUS

PDF

96.2 KB Created: 2021-08-08 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4b10046d0f31f8080d4c360cdbec7511 SHA-1: 69b0f4cb285fc7f28818ce7156e328182f226bd7 SHA-256: aa59f3ef6f316668cf513e1b6083500d3b7b8adc3863980b6acc6cf5078df558
96 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 CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings suggest the document is intended to facilitate initial access via spearphishing, likely leading to further malware delivery or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://wastran.ru/uplcv?utm_term=saudi+aramco+operational+calendar+2021 PDF link annotation
    • http://goldmustang.com/files/files/vakefuvubagururunedaf.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/28314043695.pdfIn PDF document text
    • http://axwelindia.com/uploads/tudepuvasid.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160753dde093c7---98893910382.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd637306957---tadebosapev.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbb604020d---26791107616.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kiran.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/28256825431.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/23588688184.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6cd15b8f---jimolibigamixet.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3ccb9a63408a5df06eb2a8c225177923/faviworuderoxojixe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e2b148f4c8bc691804da56c08f6e85fd/musof.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/50140234225.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/14a46d07b56cd8e1bed2b9fcdd73227c/nosubarud.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/gejigewamupevemino.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sj84ru1kohedtjucvj57u2n93l/12545362130.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ad39a88fc65e106272466a2afb17ece/komebomipepovi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607205dbb9291---talob.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/gofewux.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/87225196026.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7vo5qps88v4l2rt0cco32pca3o/doxajopiz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087beebd6588---29014173573.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fd12d2e1e8e325fe390fab92388c63a/serasuvu.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

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
stream_008_off00011f99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11F99 20540 bytes
SHA-256: edc2ecb3b101440feeb67b74b1faba57f6431a612d940437c80f6e5a8f98637d
font_00_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10976 bytes
SHA-256: 811375361329d22fa592a362400fc9502bea5c1e366a3598b208aaeafe747427
font_01_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 18008 bytes
SHA-256: c6542643c49c236fe326bfb9dafc432e5ee446b71751cc23c4178c06e807c378

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