Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece61a3912e77b0b…

MALICIOUS

PDF

83.3 KB Created: 2021-06-27 19:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 156be8ac7eed2cd14c18d65e870acbf1 SHA-1: 4521491400257a4fec057db3c25e3eda36cf41c4 SHA-256: ece61a3912e77b0b12f9b628a06ad4421fc6c4cdc470e96e721a228c7f9106d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2c3c9f8c---lufowuvotomoluxuliwom.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/eee91636168d63862b11bb5873db1915/49414974549.pdf
    • http://csc020.com/userfiles/file/20210618231436_00sio1.pdf
    • http://mobilesamara.com/img/files/file/borasaxajebilatuber.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0dcc997087dbbe6a15c3bddfccb8c67b/perisugi.pdf
    • https://tecnicadovolante.com/images/file/94891665292.pdf
    • http://akkoryazilim.com/userfiles/file/vebamoliwebaxasexale.pdf
    • http://autosklo.sk/pictures/file/jedogagagovurirazatubuja.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/cb10ba58117f5099e8db8221c9336f53/loxatabaxavanijuxol.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078d926679e2---sobususovililomesarag.pdf
    • http://alkanboya.com/files/file///94890880638.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shmhgscn5qariu7kfshf643afo/babesiduxanitobekiradob.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/455e63f669546773652a0d618a98cdf5/3050979524.pdf
    • https://okna-stv.ru/userfiles/files/konutikoj.pdf
    • http://marcelponjee.nl/ponjeefiles/file/39237944722.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50a466ae2---rumagipo.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a77c4a0a1---93072251836.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b63367bead---kivesonixojodegovoguzovo.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39addcdd95---faditabogubujewenazib.pdf
    • http://swaminarayangm.org/userfiles/file/57227763764.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/q6l9unbn3mq8k4jls97tjss6au/negali.pdf
    • http://rocb-ap.org/file_media/file_image/file/44522763354.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f3b08a69---girudinabuvigi.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/udebldn914nmbveik1lhbu421f/zuzidedupagegomono.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/dapejaporavidikoronagag.pdf
    • https://eyetracking.pl/userfiles/file/8537390693.pdf
    • http://arisutour.com/ckupload/files/gekolaludegupewin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sample+email+for+scholarship+application
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18f.bin
6f584baa33985ee4f7834461eb651b87a173f95fffae7b2396f1706868a44107
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 17192 bytes
font_01_sfnt_off00010edd.bin
abb505db0a3d6185402df796cd7fc332b552fd4feb525669c69c5781a804a626
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 10820 bytes
font_02_sfnt_off00012792.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12792 16792 bytes