Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3767742b1694fe…

MALICIOUS

PDF

100.2 KB Created: 2021-06-30 15:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b76e0421462064fca11df75f50478742 SHA-1: 84661e2588ee440f48d88871d2d23b314920d8a9 SHA-256: df3767742b1694fe4b65f0447163531912efff16506080cf38ba6c33c5e85073
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent. The presence of multiple external URIs and link farms on compromised CMS uploads points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://nomylo.ru/uplcv?utm_term=dig+to+china+game PDF link annotation
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/o7mgjegt40mtn93ohoo9qe6th5/tifigiruwudepawabov.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/gubivad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c85ebc5dfb2c2bca302a4f009bacdb90/15573444196.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/xanititabesozuzobexok.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c347055---vozomoxesuf.pdfIn PDF document text
    • https://nada70.org/userfiles/file/50450367482.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081efb0e9318---14481026192.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g1fpavq66un2i98heeamcndi93/kumonixapu.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ac723ccd56d---xixexikol.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/gojozagowewu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/sopikilebasago.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/92941edb2a0ae91be89115bb43a5df9e/10026175518.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef769be835---genesediridufi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083410b421e6---34629418453.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/35808530275.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079726540466---5259321788.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/1l0hon04mjtt6jpvudtvcthjig/dasukuduremugesamuze.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3e70039b---55906386759.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/76149538486.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/96627991035.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rufebujotubuka.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/jitidatilonevaxagab.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/nobiwogan.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/fd85b5e173c60a4a0c5608d87fa6cd55/75112865712.pdfIn PDF document text
    • 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_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 10364 bytes
SHA-256: f2277db2baf3d48f7135460c1394e0165619bc426b6a5a3036025e18f60c6e77
font_01_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 17884 bytes
SHA-256: 8d6afdea11044a80e64ae59276edbaa425ca62137e97f66da0a2f5da0404ab48
font_02_sfnt_off00016ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1