Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e707846494cd21…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 09:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e22c8e529d0b9ccccdcd101ba12cfb2 SHA-1: e3cdd4fb2dbf03683a280454818df7bb5e1dc323 SHA-256: 87e707846494cd212d1368e80310aef75dad19c4ce889b9d436f60c3a8bda998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b4911042ddeb2a0af4f83d475e03c7ba/kujiweminerowaxibobukifuj.pdf In PDF document text
    • https://szallas-karpatalja.hu/upload/73670181858.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e008f285b3c---45392289383.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/020plqgheprbb2f47b3tlfqr76/mawilijar.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cdc8e19f35f26a8bf47b9eb605024177/bixulapitudigax.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d850ecde35e---makug.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8cba3d31---5716873087.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210729194721.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00e12358b3---xabenegivisotenelinu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/penixigigivapakusadewad.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/62380125844.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/20245639359.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a0a6586ca871c81a2d99d4ea0b7b65f7/20045935474.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zukaxazeduno.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/0uhfu3c7me48gedahh170hp940/12836415209.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085abd0e0dcb---mivivutekebozigupij.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/nusujemilegovaxidofarule.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931d9888124---negapu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e553bcfc95c0f5d3b128c118208bac69/42792534768.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/98039492915.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/605q268a18oh80i600thqr55r8/tugedipozin.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/76120823794.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/66290064792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=history+of+nelson+mandela+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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 10764 bytes
SHA-256: ffb33567b692c1b239a5121c67b15bf1cde7851a5baf35b794921f553653aef9
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 17640 bytes
SHA-256: 367a039fbec28e68ad175f6d341cb72af1ba05e508109758094208b418d05999

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