Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e4568d66d54ca6…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 11:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79a35a1353071a8aa8d81c38a9b1b238 SHA-1: da143cc47d32850e5e6a941638646a762ff409f5 SHA-256: d9e4568d66d54ca68ec3c644f47e943d04f15e3486776f6eb0aff7c2638a69aa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised websites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of multiple links on potentially compromised WordPress uploads indicates a tactic to distribute malicious PDFs or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gabortech.com/admin/file/rofawedipitomajolej.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/u9g44of42shlb1qa1q9ksntl14/rosidemin.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/r7ameviean4jqkd85mgd4umdkb/tisojifewilulemovoparuze.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/eh7kvr1tfbq530hg869h19gt67/roveguvaju.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/ratujilidikumexefi.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/48676650153.pdfIn PDF document text
    • https://orrizon.ru/images/file/37078809665.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2eaa05fb1f7e41a037500ba59f095280/9266675094.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c36d273e2c435067253e1882e721cab4/vozitafukaruledamekum.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/sukavepofipo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/32352508048.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jipifowe.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ce262174---58084776319.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/86125884990.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/mubozijozotazodijite.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/luturulig.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/35542543007.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d395d5a30---mewixodudesitinatutagu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/25991489706.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfce253755---3397913904.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/48671294569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=react+design+patterns+and+best+practicesPDF 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_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 10708 bytes
SHA-256: 1c1b5f874eca9d31d304cfbe62fa4c3ecccfddb75e5deb7dc256ff5b1e38687c
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16480 bytes
SHA-256: ded4646f21d0e7a1622b68ab0172fa26c579ad81299c5bfe7a58ce3b42a8ce91

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