Malicious PDF — malware analysis report

Static analysis result for SHA-256 01715ddf4548229a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-10 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff10ff99aa8c7cd53d2291389cb6912 SHA-1: c5ed43962415b512ac2b58ab890bf370dab0697e SHA-256: 01715ddf4548229a87b1798dec1e31d729d80e3ec3b4ca3c16922da3a972a98c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://naasschoolofmotoring.ie/fckeditor/userfiles/file/56071183216.pdf
    • http://demkapi.com/resimler/files/58638541543.pdf
    • https://vilus.cz/userfiles/file/78427834285.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356f0e385e0---55824779532.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/lajajadole.pdf
    • http://techscreening.com/userfiles/files/lomajaveronivuvam.pdf
    • http://vilocom.net/webroot/img/files/53375669948.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0d07185b5dee805a507f56d0627b4b49/5506835801.pdf
    • http://realcomfort.ru/content/upload/file/64624936822.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fad86da7c---dakitubelowijewixetirag.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/60596763667.pdf
    • http://www.medicellbank.com/userfiles/files/78545225734.pdf
    • https://gsacademy.ge/uploads/files/11223824794.pdf
    • http://eraldocomo.it/userfiles/files/jonelifuvijiw.pdf
    • http://raffaelecavazzoni.com/userfiles/files/5999441029.pdf
    • http://gsxr.hu/userfiles/file/fubamojudijetifunolug.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f15e7472d---70539885000.pdf
    • http://romanasulcikova.cz/userfiles/wusexuxoxakitonamoragapu.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/28809333405.pdf
    • http://sandlnae.com/data/editor/file/xotibisidumafik.pdf
    • http://www.aragonemprendedor.com/userfiles/files/gapirenabilopuga.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepun.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c5a6755bcfcc8481eaef1449935df740/ziwever.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=m+tube+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5a.bin
4f43ac8a43f34a3429f2ef7c96bc1272303b2341cecec218ab76751b7b6f8478
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 9940 bytes
font_01_sfnt_off0000f43f.bin
d7c5b58c45cbff52197f2808c40466e6081921cbcfbd11d9b21abaaadaa69b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 17568 bytes
font_02_sfnt_off00012197.bin
0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16448 bytes
font_03_sfnt_off00013870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 16792 bytes