Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2a2190f9355ec3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 14:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20620b5bb25c2bbe60aefc34daaedf16 SHA-1: 9cf41e07ad2442ff3e6cbf14d2a651bc32869571 SHA-256: 9a2a2190f9355ec32b1e373ef141410a7b0290a70bd068f9103a7b31d77dda36
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://rasciindia.com/firetech/ckupload/files/tipexurexuxilagi.pdf In PDF document text
    • http://pogotowienaukowe.com/Upload/file/63465904940.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/duvebinefupajiritujez.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9l0btv5qq4ai5uoefmvc4n6bpd/falana.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/620a2f4a8fc5fe4e02badd4648a69c6d/devetuxeforanonugepe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1274f509c20823ab02c91db814553306/43188750824.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2aa579ba---nudomibawunef.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jibofopilow.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a17622b1a---juxekalebetigaladod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8884ebf1c---35705369681.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/57623015029.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16121912880d9a---kagobivevubunepetu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef136df4a9---48529046995.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72446ec8f---99802937453.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/xatisuxesogujobozujakegab.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/5lcq957rlmh39na2538cnu859u/34490022263.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0ecff1d68473bb3ee6fef158b033654f/sikiredewudav.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/tizisawefo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/2d39cbf089e38a1f6544192cba6b50d4/finewamawuwim.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2bd2d881bed24bf3554b2828f917b9ad/doneto.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/47591265790.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/tinigupekixipotavega.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/58cc3246eaefcd6afcd5875ed8629ff4/mafemegeguwawemexexedudut.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607991f30d0d4---47403115204.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/bofeniximepali.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/ruvosuvolovimibomiwazof.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/44c91b9ce214c13fc46eb326460574d6/92103574828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pied+piper+of+hamelin+poem+pdfPDF 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_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 18072 bytes
SHA-256: fa6b82ff739832400531f987cbe6a001925332ed1fd0453f9a35feb8b47589db
font_01_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10496 bytes
SHA-256: b2639384b21a58248c938c82476c8b85692521cc6a225ee9ada31bda37bb2eb8
font_02_sfnt_off00013876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1