Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14a34aca8d3809a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 09:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76edfe685fa63d9dca89f3c6ba91ed68 SHA-1: a1695e5602708a50493d9c5729cdaa02ed4a53e5 SHA-256: c14a34aca8d3809a6f92fb2598f72b2d0720ba6574936ade13a617ac05cc58a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download chemist apk' URL, despite being marked as benign, along with other unknown URLs, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bibonatura.com/ckfinder/userfiles/files/miweduxifefoziv.pdf In PDF document text
    • https://skiclubraonbaccarat.fr/pdf/3070186550.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xosupajobipobamiv.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebee56a284---sabezajemanetojigame.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/tegebuviwipi.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/gukor.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/14370232889.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/mikis.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/leniwavukebikumor.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/86826999627.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/patesigebufidagasafisato.pdfIn PDF document text
    • https://stormester.no/files/file/lonelogutefawut.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/66328027758.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/xemoluvuwafakedotu.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/16424718660.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161443665c9803---duserolasudiregab.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf371bf4d---95924547042.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/ruvusesotobegemozixu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/motexetajijuwogodogoj.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/kowebok.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagujaxut.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/87252014312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+chemist+apkPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10860 bytes
SHA-256: 362f9bf86698a69bc6cc4905da46418703169cab7816bf9e01f00b0494f051e7
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 19724 bytes
SHA-256: e19119e73de0ce72083dcd687250805b0fdf09871e582dbbe17b0f2c003a7258
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1