Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc8687b38d2fea0…

MALICIOUS

PDF

89.3 KB Created: 2021-06-25 22:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 066cd15704408d3c343628afe7db0eb7 SHA-1: 4afa03e9f85290bbcfdc23ce38404fcc39c423c0 SHA-256: fcc8687b38d2fea0eed227f6d65965c6fc4edae0bf425950a222873c9c3c1035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple PDF files hosted on compromised domains points to a campaign distributing further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3571cc708---kujegerobebovopi.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77b86c65d---dekinutewixidomolufiwuz.pdf
    • http://techbis.pl/files/file/82245784266.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec783f212---zuliweribizi.pdf
    • http://sciattella.net/images/file/gewusezigij.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df89da739---96665693056.pdf
    • https://albawadiroad.com/userfiles/files/71073399193.pdf
    • http://kassa.pl/userfiles/file/mutibifiv.pdf
    • http://eko-inwest.eu/upload/file/79446477521.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086754c9548a---jejigig.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18d0a9c30---95647486177.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dm0mnhooqvnu1r30vhcvj84rc4/73719402590.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ae979aa6a23014b0bba8db2cbe6f80d4/28075599915.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075790d3ca17---gavasekiretufexavogebon.pdf
    • http://artospace.com/pics/file/pobobole.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160757dae3eab2---jiriguxa.pdf
    • http://gtshotel.it/images/file/nolug.pdf
    • http://campfirewtx.org/userfiles/file/61952122591.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae13129da4---jobipus.pdf
    • http://megalabsrl.it/userfiles/files/70890675420.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c197eda0f---20041148618.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c002b987a5e---lavepaluketojiguvut.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d04086f67---lofevi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=broiler+chicken+production+process+pdf
    • 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_off0000f984.bin
2aa9f13c09d5906a56a93a0d616a24aae0985e01bbfd41942298965fe921fc6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 10800 bytes
font_01_sfnt_off0001125b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 16792 bytes
font_02_sfnt_off00012a6d.bin
eef9553022fdc49c6e8f0e78a52a68708289e93c7e564a9649077ad6b3f868cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 17416 bytes