Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bf9507018b008e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 06:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3363e2325ad93f46c0d415403a5007cf SHA-1: 6dc47e9a24853f586434b8eb7876692cfd93815f SHA-256: 26bf9507018b008e3fe6906cf30a6970e627f7f12bbd68ffb088e506ff3f1075
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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://tvcsoltau.de/userfiles/file/nowizib.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/478635f678b1aaccc5b4b82a433bda7c/tefofusabuzozimodi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dcd046defdbf9bfecbc30ec1c0886bad/xuzojasejepafuvevonowoto.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0df0ff1127f37ff265aab2a4bd1b4b7c/44308202043.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c44db8ffb8de267f9985a01884575fbd/dusifiboduguvetasoroloned.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/37439438706.pdfIn PDF document text
    • http://adveotec.com/img/file/giroj.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/92697258809.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/94443020561.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4nnbmor1rvt2hb0jb6qipvqfps/losapojubivafisejumemej.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095360002282---50300416375.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c2ad1b7ef8012c9f8335e615fb34f1be/jibakimizakuzesiguvifag.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8873afce0---vekodi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/7u7c6cg0u3h48f42iqbjhsv6j6/46189002712.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/23369029581.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/46283125733.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/43781924485.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0cf20648---94268509686.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b322b1008c---jisibavikereja.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1b21a6c5a52848381d907e6790a9ff93/nasebut.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/30484349535.pdfIn PDF document text
    • http://atek-ent.com/upload/file/68720798193.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/pepuwigelolupa.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/kadomawumunafuxixe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7398f394b4485470d99cb246002eef57/wetujakisipaxaroxazipera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=10th+maths+chapter+1+solutionPDF 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_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 17496 bytes
SHA-256: d258dad0323cc83830aea84b6286cfeb9f73f2cb99fccb2f519116c2b2096312
font_01_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 10816 bytes
SHA-256: 3d861f0860caaf50dc8db1500c2b4856491ac5551bddde15b6ebe709767f64da
font_02_sfnt_off00010eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1