Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55aa2743a76e4c3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 01:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92cab3f6bb06fce38f2a42aa87f97394 SHA-1: e4ebf17d52bf038b3a2c37e80c0ee11030e3024a SHA-256: d55aa2743a76e4c3d913879a1104dfb2227b0987b6dc6d4883a9d0d78e769136
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, acting as a link farm. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c586d71d---zumozi.pdf In PDF document text
    • http://krakow4you.pl/krakow/files/lowiloditaremilegomofa.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/33960914502.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767d9a3f0ac---tebataz.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/liwowu.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dirutudime.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70eae189fa---fofenuxobudagasone.pdfIn PDF document text
    • https://mediaskills.rs/files/vilijaferoripikesokeka.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/48134305603.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/sefabuge.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/15963635611.pdfIn PDF document text
    • https://people11people.gr/uploads/File/78888929993.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/24645743059.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/72127859719.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4a0089d4b544f45b8421c08db5b0d0c3/46846830825.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/ruzibabejozedatevoworomew.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/wesilosozuzagawifofugamo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e657d1777c---sasemugeruvo.pdfIn PDF document text
    • https://combrooncom.com/contents//files/benuvavewifugulafo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/507dd66c0b64dfdd0f1b55d26c745b5a/66435406667.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/58291324173.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b4f92cc0---7212795446.pdfIn PDF document text
    • http://freeski.hu/freeski/file/79843123172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=balarama+online+pdfPDF 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_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 18100 bytes
SHA-256: ce23ee50b8732381d6365a11156998a50d9e6cb193ee1eb6aaf0bdb90bbaceea
font_02_sfnt_off00011134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11134 10448 bytes
SHA-256: d494e35164995fce69436ad7862e9c71434b74f899e4c9dcb47982c59b1222cb

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