Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5e8c0c4b929e07…

MALICIOUS

PDF

95.5 KB Created: 2021-08-13 19:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 990e8c2b2364781770c49485ea3c75e5 SHA-1: 8e775ee3ec2db6a09bd5feed6b06e3373e498dc6 SHA-256: fa5e8c0c4b929e0759079b620e70b7493586665a3ce3a69d81628f5edb621984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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://foodchemsino.com/d/files/26894776086.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2h1plql7s82ablc738b6ukofjq/19016705803.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8118600d44---71757093254.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/28589136779.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fbe6ca2041a9e2ef8745e01f9927de44/66916477042.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/m7ppaabft0i25pt1bgtgqg0gt2/tibilavaxuluporekixivoneg.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/ledukepokapuzamunaxa.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210704182919.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/412d1e3cb11385386b788b147bbea345/pagibitido.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/19415765067.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/55129779573.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a956af81---35977849721.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/21562323483.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/35876172d0e51e9f9ecfd283550eb051/muguwagoraloxigu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeab11b54a---tuligunisirup.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/wejaximu.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/sugegomulajebokisu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/12642281295.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/basanidutomosusevewezoxib.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tudakelemajaxoketizulijo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0e153dac7---bexinevunetojur.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feaba9bcbb7---kemugenawafurufarepuxojun.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab4592974---12724525659.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863bd3050fe---nemipazigosodoroju.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/89681713113.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e4ca62fb7e05a65e792b295b6bbabe62/12383774885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+use+video+filters+on+instagramPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 11056 bytes
SHA-256: deb84a9977171df2dbe30b1d67aa15e12b31f61b639a1d6eb1d8d9e637a5c894
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 1744 bytes
SHA-256: 16c61f9d967f3fece9b6a22a95496a8a81954608bb3421ed03468d991ac109f9
font_04_sfnt_off000140d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D5 17412 bytes
SHA-256: d755a9d8dea2e1ce9433a2e96e6109e03a314e52723e3d5f6f6229bf921398fa

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