Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1d73e1c4915638…

MALICIOUS

PDF

73.0 KB Created: 2021-08-28 06:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 281b09800415032e9e35bc82520cb357 SHA-1: 778a6fc6dd13edd4a130f47627fb906cb0bfc4c5 SHA-256: be1d73e1c491563876c2dfc2022fc7e95d07e6b7335d7d44ae1c4a6944de9958
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a phishing or spam campaign aiming to redirect users to harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2fe8f31b3---detewajazurojuxixat.pdf In PDF document text
    • https://esperanzadeavila.com/fotos/file/89059107283.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/nunuwumejokoribonafotek.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a9bce7db---vazuvi.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/fikuvigodasejirum.pdfIn PDF document text
    • http://limoride.net/gallery/file/62694959810.pdfIn PDF document text
    • http://accronline.com/userfiles/file/88358491403.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/231c4e993f55f487f575a7f240a18cc8/pibewibixales.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cc4a163a---88395759927.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/78085044127.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7362a73ac9---mojepuvulak.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/54868598997.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/64487806311.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6b5e3a54e8010b6cdbdddbd73225b8ff/57299822687.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/velogefelofu.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/delizodatajigupilez.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/66813627100.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/25868647591.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160754e42a94b4---kevogifumesodibo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/58454152016.pdfIn PDF document text
    • https://digireg.se/upload/xizowosisinejer.pdfIn PDF document text
    • http://zae.me/datafiles/file/toxagabo.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/kovone.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee69abcc559---bokigizopuwox.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3977c5a55264fab7e46b90414d4e3701/75865523978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=where+are+you+located+answerPDF 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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 14660 bytes
SHA-256: 9cdf97369c3bd01f5005b7b2afddd2efe0711f6819c14f3658fa84da9fbd17b8
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10668 bytes
SHA-256: 711afb191dd2271ed3ee8d7da5bbd9d96b1ca5af8edc97e7953d473c113ed32d

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