Malicious PDF — malware analysis report

Static analysis result for SHA-256 5615fe2e45d350e1…

MALICIOUS

PDF

87.1 KB Created: 2021-08-09 01:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82f0bc8dc530e3c00a802041cde8691d SHA-1: 535bcf8fa7b9da87c6af1e4d3623c29e40064e9f SHA-256: 5615fe2e45d350e1a5833178602995f70b773d155c2d1fa8f191cdcd8f8ac04e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the detection results point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a365020160d---vapudodubelan.pdf In PDF document text
    • http://jevades.com/aircraft/fckimages/file/wovibuvexenepebopenitapel.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728e8d852ce---tiworuz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6f928acc---berakotorutuzudoxatozera.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/pr11qfr220d2pt47e0fiij2uf7/fapogabepa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vigibudu.pdfIn PDF document text
    • http://epmachine.ru/d/files/41904760669.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe3a2db7---jovajagokojazo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/iads1rh6gttpl1kkqdmfvfmnlt/90795786725.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5015d295f---53141962893.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/806898dfd24bd8c4f7592aa604a28af6/34217037867.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/pafetovebikuvufizozusaja.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d237d804d54---bopujitu.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/bakilitufos.pdfIn PDF document text
    • http://01host.ru/userfiles/files/6213747824.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e76b750f8ae6b42caf47d9b89dcd967e/7229524690.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/gimozedesap.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/supixivosijegusorubul.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a726a97b098---98068731902.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/j9g9kda5k4hj921icf3i1oi7ro/70462447248.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/14690510911.pdfIn PDF document text
    • http://kfbi.ru/content/file/bedibivigatipivege.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/xopetara.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/nofizineruz.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/78079935758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stihl+028+super+wood+bossPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 17512 bytes
SHA-256: 582261d32d6d3c08e524e3ead90d80692c280e1b29f70a72899423ec06295505
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 11072 bytes
SHA-256: 4f91e064f9680369cd204bdaa74d90a0f5ded590471f6fec192c478988cd05fc
font_03_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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