Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafdfefeab2bdbe1…

MALICIOUS

PDF

87.7 KB Created: 2021-08-05 22:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36d5272c3e1df7796b218470f37cfd79 SHA-1: 1bf15bf2bdc5789253ee712a80a4a1655189e488 SHA-256: aafdfefeab2bdbe1447b05ebad19e1864a2ea79dc2e599f3b3a894ae48e4496d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic indicating a QR code redirect lure further support the attack pattern of directing users to malicious sites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://karapinarinsaat.net/userfiles/upload/file/28826899648.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4309820ef494f5b4d8fc315f55ff4624/11957485545.pdfIn PDF document text
    • http://whatdwellswithin.com/file/55505236589.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/88335c87bd03a20de966225cbca9dbc5/92713584915.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e68e840bb---vemivalelomozazofutujepuz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212ed4d26---45948637213.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088d2c04cdd0---tiwifis.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/68322777609.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/zasudovatuwo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/37741628193.pdfIn PDF document text
    • https://vestol.bg/files/file/nofuzenezuvofibibonokav.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/11502280408.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vuzufaz.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/tupijixava.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/rapaxukumofimasir.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/78513882724.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/nesavidudezujim.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa990c688d4---87187262394.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9187d0b3a---wupuwanewivefavudaw.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070328805e3d---60633090501.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/37770190833.pdfIn PDF document text
    • http://co-mit.com/uploads/files/47534781404.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/14364677143.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/33310969208.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/dumuzefodegokezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+airplay+on+philips+tvPDF 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://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_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 16960 bytes
SHA-256: 885fc8bd1652365aed199502e584a1ae63c5b8cb5cadbc18bba8334271fb616c
font_01_sfnt_off00012371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 10788 bytes
SHA-256: d500dfee40e3178342cf86412c28fcd3e47fb27d63f4b61f0821a6766c0f8706

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