Malicious PDF — malware analysis report

Static analysis result for SHA-256 319c44636cf1281d…

MALICIOUS

PDF

177.7 KB Created: 2021-07-26 01:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bcd15b46cf8a5d9486b575afb3e39655 SHA-1: 599cebb70e4ed7141f2c2378c42dfb2fd8d068de SHA-256: 319c44636cf1281d222039c94f8a89cbc03442dcc660f330731ee1bb1415ac3f
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. The presence of numerous links on disposable hosting and compromised CMS uploads further supports a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab773f2c1a2---86606877056.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d403feb60e---malopizexowidus.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/50e4e6c56c579487b00412fe9ba2c50e/25634299290.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f12d381b---98929807833.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b1577d1b1---19020719437.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160770d85e3b23---53432256031.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/dafawiditejaku.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/6o6j8flm0flmmu0lsb8o2rhthv/8355588255.pdfIn PDF document text
    • https://istanajp2.com/contents//files/64027515692.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xuvebujixe.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/fevifodinebabexavisosem.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829e6024d33---48446827934.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/xeloparemalivet.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b1badd99d9239ab471f56c0368d3176d/26171053558.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6f9e0f2a---jexeboziniwejazumasilaf.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365498be38---37869218766.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/leguxajiwiputoz.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/19736333508.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bep7nf84mkv8t2gd6k4ansjqr7/21278590523.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/pepanumixexirid.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/37278704546.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/24hp1oj0s54igihkqlahicsv2h/78844671657.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099adb241fe4---dobumik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/99a4aaa361f06c2a8c0fd844088c0665/jowej.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d83f7928d---62345673994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=briggs+and+stratton+450+series+148cc+manualPDF 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_off0002115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2115C 11460 bytes
SHA-256: 2e43bcc152353b1fd967a5b7c247746cfc5346f6e8e0d22a53dcc59043261500
font_01_sfnt_off00022c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C59 28648 bytes
SHA-256: 5ec8c634f014059a594fdf5da3ea66d89d0b945a7b684b2afdfca5937e6e39c9
font_02_sfnt_off000272d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00028adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28ADF 13652 bytes
SHA-256: 3ecaaef59fe0a3f129484befad7b5390645acccf2835508b6604b58ef22b9a52

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