Malicious PDF — malware analysis report

Static analysis result for SHA-256 66794c5eadc42789…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 17:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5224ab7717c99ae860adfb93258319d8 SHA-1: 9ff90718f96230052a99a98766d5f5761bb5f018 SHA-256: 66794c5eadc42789295fd273d1cd2166ff7da20d14740886f34159141a9a0708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF likely attempts to redirect the user to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://eklyps.net/images/file/50204761511.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4c961b870915c3cbd466a177c3f02c2/sozezi.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/39071862204.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fimofonuserogipiz.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/57072gv88skc35n5gfl5hesf7d/zuwed.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b00a815c3---85494326036.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/sazatewajalo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29503940371.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166483b216---jixejalebanawetijigorekox.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/40593879515.pdfIn PDF document text
    • http://debden.org/userfiles/file/rekedodejixelugupem.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0c01c10a8c07c58fbdd09d1ebd812eeb/94793477087.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3d5138ec40819b3ed6f5a9ab8d5d1dbd/jutuzasuwonipawaluw.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/86507969727.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/47444273389.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c563fe6b263---75577580828.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/55260c1600815f3315ec2802844e59cb/xibawodixu.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/fupexajogi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/64ad887793214cc44b9b69edbcab96e0/57936902411.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/21082166005.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/63589362851.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/84a286de91414e2d05154b17d82463fe/9548052783.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/vukanakeresemajefuxoje.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/zidapawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=number+writing+worksheets+1-50PDF 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 18012 bytes
SHA-256: 8ebc70f97edb5e26d3652a8a0714e83333bad25a7f7feb29ffce525a5019b683
font_01_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 11084 bytes
SHA-256: 8e82d79b8b9d787614a9a7177e06442c090869dbfcc4133b507eac9862b750e1

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