Malicious PDF — malware analysis report

Static analysis result for SHA-256 033d32874f6feb7e…

MALICIOUS

PDF

89.1 KB Created: 2021-06-26 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fc5210f13ef7d836f0a17c0f5b2240e SHA-1: a5a5324cd641f10c659732431248a7a985dec753 SHA-256: 033d32874f6feb7ed3a375abe603b1066cdbdf38b4f0675cc3fd16a190082ed7
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of an IP address literal in one of the URIs further suggests malicious intent. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://adabaskimerkezi.com/upload/file/wafifuwanubaresamakeb.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9194f1d3628eeed62988e0955e2105c5/6952545666.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3928ffae2b816eba0c4b03b50a7160ed/konivepoloxugeka.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab1b2fe48---18100087190.pdf
    • http://agnieszkapawlik.com/userfiles/file/98242253314.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/efeaead5d9536210370adcb93b033e3f/xepageravoz.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c388f52437e8610b83ba91fd9c200ce0/78549727130.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d18c07c---26578334854.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac7a80e4c---wolojeluxikopuvodona.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b2b9a24e---24144974355.pdf
    • http://akcjonariusz.com/UserFiles/file/36669145553.pdf
    • https://altonika.pro/files/fck/file/setukebixegumefoteb.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc42db746---66021318471.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fadc1949a4---zixilixadisexokevipu.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/12ki12p9dbsjlipvalqhbsa7io/67857739862.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/360ba294822ca2035453f569f1bdab8d/kaxedukokezokujefefozom.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1d568649cff1ca64b9bb2db58b244250/buluseb.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160753a782a6cd---40345829303.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/junuzison.pdf
    • http://pantryscan.com/123cars/imagefck/file/45122256660.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbdca09565---duxifimabenifexuwuki.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b2ade43c---febewiwuxur.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/944ae9b6e88dc26b007352f8fd401654/35535829928.pdf
    • http://airconbank.com/upload/fckeditor/file/mivowuri.pdf
    • http://lorichphoto.com/pictures/file/litavoruwoxividupisizutiv.pdf
    • https://edcasys.com/ci/userfiles/files/71631559310.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=do+you+get+fatter+with+age
    • 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_off0000f966.bin
920c1cf4b2854af727419d335022e7af5f6eb5536e026c0a0dfb4121af91046e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10476 bytes
font_01_sfnt_off00011172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 16792 bytes
font_02_sfnt_off00012984.bin
c48f7eda9634831d5ac60c42fa62c87c48e5e561f27a98d352bd8711bbf223bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 17552 bytes

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