Malicious PDF — malware analysis report

Static analysis result for SHA-256 887e843f9ee48460…

MALICIOUS

PDF

99.1 KB Created: 2021-09-11 07:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79ea0985cea20e17fbff4c063ea5ed2f SHA-1: 67017285e27e1d08ebd1e3ec0cbcf1242425fcb9 SHA-256: 887e843f9ee484604c08a8c92b505b8cd4277e69ae2a9528a28c6e08d518a5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://archism.ru/uplcv?utm_term=introduction+to+machine+learning+alpaydin+pdf PDF link annotation
    • http://nenkin-t.com/upload_img/ck/files/gewetuzatoworekifopemez.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613527209d81e---42310074084.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/33340301116.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xufepozibuke.pdfIn PDF document text
    • http://headrepublic.pl/images/files/7657208803.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/43543397810.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/70979645075.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/gobaxejudubipibazez.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/bomomegewax.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c202d5c17---jaxedawozobafamorubedu.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/64803237072.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/0fbaf51d4eead66db851779176431c8a/88979375645.pdfIn PDF document text
    • https://etadelloro.it/images/file/58360176298.pdfIn PDF document text
    • http://519pf.com/userfiles/files/gifikizizekefum.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/niwikolomeb.pdfIn PDF document text
    • http://airfa.it/userfiles/file/84039972174.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c0103983---limowelejoziwutigo.pdfIn PDF document text
    • http://manu-transport.com/documents/file/97189390157.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/91646274943.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/81763671301.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/85303733500.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/52639776317.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/86477737877.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/zibexesipudalise.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/60328872294.pdfIn PDF document text
    • https://nls.vn/upload/files/lujefolipejapafazun.pdfIn PDF document text
    • 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_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 11064 bytes
SHA-256: 9d567162ede836f671a944e1e7d082bb9f7501dc19e03be18b256f179dfaa341
font_01_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B30 19708 bytes
SHA-256: f9515a03eccd80efb70c4a20e06f14a40ecf3cfd6eca55c561b7dbfe718bd22a

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