Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78b5200d2e7a6d3…

MALICIOUS

PDF

83.9 KB Created: 2021-06-25 13:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3ce03110f4ec54ab704dd9a4e3c8abb SHA-1: 8f2c599276923cca98f1293f21c46284cb937f98 SHA-256: b78b5200d2e7a6d3272216a11e54a8ebba7626f838aa1aa93c3c00f2f1806faf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous distinct hosts and UTM parameters suggests a link farm designed to evade detection and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=new+forest+water+park
    • https://avgdesign.com/userfiles/file/58296400613.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/70af008ff2fbb0b8d796afff623315a0/10881773510.pdf
    • http://bigxra.com/uploadfile/file/2021051709353573499.pdf
    • http://palyavalaszto.hu/teszt/upload/file/jalazafa.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf61044078---pitib.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac710431b6a---33112556192.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607127ac8d5d1---kopelumufegazorogupifi.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb60064b3---83792667559.pdf
    • http://learnazia.com/fck/imagesfile/5146684640.pdf
    • http://auapp.ch/userfiles/files/gawusodiroxagapifogoremiz.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/57477315028.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fed926910---delexaniromovixelogepegi.pdf
    • http://alhouti.com/userfiles/file/44682266795.pdf
    • http://washchienluoc.com/upload/file/96592113844.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/natisogexe.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098463a20359---96684388602.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_off0000e3bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16792 bytes
font_01_sfnt_off0000fbd2.bin
e4b4f120d8f794e3b9e38d7d04efe166d299e08d75cf5ace4030dbeb77befaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10264 bytes
font_02_sfnt_off00011333.bin
5375d4a4156d85a669d3780993d5f5cd6366e472c1dd3c2ffebe0eb51fdb71fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 17664 bytes

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