Malicious PDF — malware analysis report

Static analysis result for SHA-256 55de056f2db4407e…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 09:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e4f37a1c82e7d666ce05f89c072149e SHA-1: 6940cb3892bd46f1e49d75a3cffc3a01d25bb618 SHA-256: 55de056f2db4407e880ff607105e194722efe0268d0ef493adc21ccb242c3535
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://villa-carlshorst.de/sites/default/files/file/vixeditawesaroluxof.pdf
    • http://thankschicken.com/uploads/files/xujegolemopekageminafome.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c9380c5466abdb66d744477cb97f2ac7/zozajimekifi.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/74009fc62d7fc4f864db8766ab825bd2/gisaja.pdf
    • https://balajihighfields.in/userfiles/file/fibevufajosana.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1321ce97---64081573549.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/38e96c42dc0ccc603a6f4b9dc26672f7/31559060276.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06da2c04---lezemutazoludegewa.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac88202068.pdf
    • https://dineflon.com//files/jemofizikomogosedalirivod.pdf
    • http://lyzebrno.cz/userfiles/file/72837835187.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/d8ur2sm6nrsde6sgo6e4mpfkug/ganewa.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/uafv94ldrlqi23d3n7151q4h63/roxojituriw.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/15948487121.pdf
    • http://ajivikafinance.com/userfiles/file/89103438497.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/savimim.pdf
    • https://aadharshilaschool.org/userfiles/file/labivorobemug.pdf
    • https://sunarchegypt.com/userfiles/file/zaterebawipodutisezoxuzu.pdf
    • http://musorcentrum.hu/files/article/file/88247959963.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/33dc09f874d0d53d85a69a5681a8b3c3/jenukikikuzodatebabegov.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e99ecc40---95895656433.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4r8vh19sgk2sq1i87f85v1fon7/xulirujodikez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=lesson+1+skills+practice+mean+answers
    • 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_off0000ebde.bin
c9940c1d1dc37d73b0386e0f5cfd0cef2d0b79e4da1bc73eb822d2a8d362a6e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 10724 bytes
font_01_sfnt_off0001049a.bin
00f28205bbae02f53aa40cd71d8ae610a155daab00634ef1316ee2bd83471066
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 17104 bytes
font_02_sfnt_off00013111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 16792 bytes