Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60c2eabad827d64…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 07:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17c6431d1ed076442d28ec5ecac524f1 SHA-1: 3d927fa0045b999b0d8d23123436e1ce42cda669 SHA-256: a60c2eabad827d640e1892510f27ec853eea3ce96c32f930842426e05611f75c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it contains malformed streams and functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of external URIs and link farms suggests an attempt to redirect users to phishing or malware distribution sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://smidgel.ru/uplcv?utm_term=how+to+create+a+calendar+in+android PDF link annotation
    • https://baglab.pl/galeria/file/39831119508.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/99710771787.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4811667ac3af00727357d966cbaee6e8/lujez.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210905043349.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fovadawogulomiwepoku.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/newobigefomugubegi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/vugimuwunupowo.pdfIn PDF document text
    • http://belst.by/upload/file/sulipewegod.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/fewusanenoxofenifi.pdfIn PDF document text
    • https://unaizahic.com/Files/files/zopibabepupozozazug.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ougcj5s0roqfiftckf829r9ogq/sivojavigiwukenofuritenif.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/587hngpgid943o79putr31ee5k/damemabenubove.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lumil.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/338f7a7dc37c8ca50e1928aaa90145f5/99390228702.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/60971449100.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/76150518030.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/4290473256.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/12694470756.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/bakofukosisuwafevugala.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mrak27o9696gsujb33stj5b2ou/90168432914.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/47527067071.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24180714295.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/61024360211.pdfIn PDF document text
    • 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 10272 bytes
SHA-256: c270dd0c6221001b9230b0f835c3c9a15144007350b2a4aacfcd4fd102f418df
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17036 bytes
SHA-256: 99f3575d07205ba236e8a49823430225a125c7118da95f1bde6f3e8ae5daa6b2

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