Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0ad2ee774fb0fd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 07:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cc6f3c2e88a6a3c42cc03399c677f83 SHA-1: ab7d6715777a38ad5f61af48b9849b377a36906b SHA-256: de0ad2ee774fb0fd91f6dd255ea501909b898622caaa2a6c863a4063c192fe4a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lecieldesandes.fr/ckfinder/userfiles/files/37863364095.pdf In PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/qn2s64q4mq6j5g81vlu6n5aa8a/sikiroretukimigodome.pdfIn PDF document text
    • http://ciskmv.com/css/file/guwezugufosugu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/886p1t7s9u4upcdc4ooeqgso6r/18684933532.pdfIn PDF document text
    • http://webbuilders.com/files/file/nulodebavunalezovatet.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/liralo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97267290512.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/34221073727.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16070204665cc7---fokemetonoratu.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/53664596760ff4d53dadca.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/33dc8482e15de1740dbb2d83d11640ed/93226116718.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/33312646026.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/piler.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/99835507056.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/dulafitizomademalitasom.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hovoehoonn9p8474kamsvr2g52/40634799475.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/loduwafojeka.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bca3649e25e---19523678667.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/fudejofezune.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nafimegomezelil.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1taettsoo66mfpf98no7a193e6/28745690824.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/fewosimezomowow.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/99038585219.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ehsj7b6ron4var9qi3g7kb6q0k/82714611400.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/20983688587.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1k1f28rtk1hff4mooiviik32pg/kefivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=substring+from+end+of+stringPDF 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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 18680 bytes
SHA-256: 87bcdc42934e82738c90640e665019a540eaa763c31939ffce83ce9e2572a641
font_01_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 10804 bytes
SHA-256: 29cb097e14df395c3d73b37f29f8d3cbb8ecbbdeecc86fa26ec7fc0ec1543f0b

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